As you can also find in other discussions here on RG, that's due to the rigidity of the databases, so metric sizes are usually GS>RG>Scopus, but Scopus is the only one of them with a sincere selection.

Here is a selection of the many discussions on this mentioned by Jürgen Weippert :

ResearchGate:

https://www.researchgate.net/post/RG-citations-how-are-they-calculated/1

https://www.researchgate.net/post/missing_citation_number/1

https://www.researchgate.net/post/Why_are_some_of_my_citations_not_shown2/1

https://www.researchgate.net/post/Why_the_citation_is_not_shown/1

https://www.researchgate.net/post/How_can_we_add_citation_on_research_gate/1

https://www.researchgate.net/post/How_add_references/1

https://www.researchgate.net/post/Citations_from_RG/1

https://www.researchgate.net/post/citations_in_RG/1

https://www.researchgate.net/post/How_do_you_fix_missing_citations/1

https://www.researchgate.net/post/How_to_add_missing_citation/1

https://www.researchgate.net/post/What_if_I_have_citations_in_the_research_gate_indexed_papers_that_research_gate_does_not_show_them/1

https://www.researchgate.net/post/Question_about_article_submitted_and_references_does_not_appear/1

https://www.researchgate.net/post/RG_system_to_detected_Citations/1

ResearchGate and Google Scholar:

https://www.researchgate.net/post/In_Google_Scholar_my_master_thesis_got_a_citing_but_in_Researchgate_that_does_not_visible_Why_does_it_happen/1

https://www.researchgate.net/post/Can_someone_help_me_understand_why_there_a_difference_in_the_number_of_citations_shown_in_a_persons_Researchgate_and_Google_Scholar_account/1

https://www.researchgate.net/post/Why_is_citation_count_of_research_articles_different_in_Research_gate_from_that_of_google_scholar/1

https://www.researchgate.net/post/Why-does-my-article-citations-appear-in-google-scholar-but-not-included-in-research-gate/1

https://www.researchgate.net/post/Why-some-citations-are-not-recorded-which-are-found-in-google-scholar/1

https://www.researchgate.net/post/Which_is_more_accurate_in_reflecting_research_outputs_Google_Scholar_or_ResearchGate2/1

https://www.researchgate.net/post/Does_anybody_know_how_we_can_add_the_missing_citations_in_Research_Gate_as_will_as_Google_Scholar_profile/1

https://www.researchgate.net/post/Does_anyone_know_how_long_it_takes_for_Google_Scholar_to_pick_up_new_citations_from_ResearchGate/1

https://www.researchgate.net/post/Recent_publications_and_Citations_on_ResearchGate_are_not_getting_indexed_in_Google_Scholar/1

https://www.researchgate.net/post/Is_there_any_method_to_add_missing_citation_of_your_work_in_RG_As_most_of_the_papers_have_more_citations_as_per_google_scholer_but_very_low_in_RG/1

https://www.researchgate.net/post/How_to_include_all_citations_on_RG_and_Google_scholar_citing_your_manuscript/1

https://www.researchgate.net/post/How_can_we_add_citations_in_google_scholar_and_Research_Gate_for_our_articles/1

https://www.researchgate.net/post/How_can_I_link_my_articles_on_research_gate_to_google_scholar/1

https://www.researchgate.net/post/How_to_link_Research_Gate_article_citations_to_Google_Scholar_and_vice-versa/1

https://www.researchgate.net/post/I_have_4_citations_in_Google_scholar_can_these_citations_be_captured_by_RG/1

https://www.researchgate.net/post/How_to_add_missing_citations_on_Google_scholar_Research_gate_and_Scopus/1

https://www.researchgate.net/post/Does_any_know_how_can_I_add_missing_citations_to_google_scholar_and_resaerch_gate/1

Google Scholar:

https://www.researchgate.net/post/Does_anybody_know_how_we_can_add_the_missing_citations_to_our_profile_in_Google_Scholar/1

https://www.researchgate.net/post/Is_there_any_to_add_the_missing_citations_in_Google_Scholar_Profile/1

https://www.researchgate.net/post/How-to-add-missing-citations-on-Google-Scholar/1

https://www.researchgate.net/post/How_can_i_add_missing_citation_to_my_Google_Scholar_profile/1

https://www.researchgate.net/post/The_article_published_in_a_scientific_journal_within_the_Scopes_container_Why_didnt_a_new_citation_appear_in_Google_Scholar/1

https://www.researchgate.net/post/Could_you_please_explain_my_inquiry_on_citations/1

https://www.researchgate.net/post/What_to_do_if_a_citation_is_not_included_in_Google_Scholar/1

https://www.researchgate.net/post/Why_some_article_citations_is_not_seen_in_the_google_scholar/1

https://www.researchgate.net/post/Do_you_know_why_some_citations_are_not_index_in_the_google_scholar_profile_but_the_same_citation_index_in_the_other_data_bases_such_as_scopus/1

Scopus:

https://www.researchgate.net/post/Does_anybody_know_how_we_can_add_the_missing_citations_to_our_profile_in_Scopus/1

https://www.researchgate.net/post/How_to_add_missing_citation_and_missing_papers_at_Scopus/1

Citation scores differ across Scopus, ResearchGate, and Google Scholar due to variations in their databases, indexing criteria, coverage of journals, conference papers, books, and citation algorithms.

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+964770864304

You are right, the difference is huge, and ResearchGate s ineffective on citation. I have 352 citations in Google Scholar and only 16 in ResearchGate. Huge difference, unacceptable.