ResearchGate includes also self-citations. This is not an error. For general discussions on self-citations, see:

https://www.researchgate.net/post/What_is_your_opinion_on_self-citation/1

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

https://www.researchgate.net/post/How_much_self-citations_affect_the_authors_credibility/1

https://www.researchgate.net/post/Is_Self-Citation_considered_as_a_type_of_plagiarism/1

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

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

https://www.researchgate.net/post/Citation-of-own-work/1

https://www.researchgate.net/post/What_are_the_top_journals_attitudes_toward_self-citations/1

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

https://www.researchgate.net/post/Is_self-citation_functioning_in_the_same_way_as_any_cited_reference_appended_to_a_paper/1

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

https://www.researchgate.net/post/What_are_the_dangers_of_self-citations/1

Please note also that the list of citations by other researchers found by ResearchGate may not be complete. See these discussions:

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