Take a long time to their algorithm to adapt it. But rather to choose iof website to help

Here is an incomplete list of similar questions and answers:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

https://www.researchgate.net/post/How_to_add_missing_citations_on_Google_Scholar

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

https://www.researchgate.net/post/Method_for_Improving_Recognition_of_Citations_References_on_ResearchGate

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

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

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

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

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

I feel both are adopting different type of methodology to categories publications. Prof.Dicks information is make some path for your doubt.

Add this post to the list given by Wolfgang R. Dick:

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

No way...