The difference in citation counts between indexed databases and ResearchGate can arise from how each platform sources and processes citation data. ResearchGate primarily relies on its own database of papers uploaded to the platform, while other databases like Google Scholar index a broader range of sources.The coverage policy, indexing errors, author attribution mechanism, and strategy to deal with predatory publishing are found to be the main probable reasons for the differences in the two platforms.

See also this discussion: https://www.researchgate.net/post/Why_citation_score_for_author_publications_looks_different_on_Scopus_research_gate_google_scholar

Each of the platforms you list indexes a different incomplete subset of the literature. Google Scholar indexes publications that Scopus does not; Scopus indexes publications that Google Scholar does not. (I assume they both index publications that ResearchGate does not, and it wouldn’t surprise me to learn that ResearchGate indexes publications that the other two platforms both miss.) They also use different methods to count citations. In all cases, neither the citation data they collect nor the rules/algorithms by which they collect and evaluate it are available to the public.There are a few reasons why your reads might not be counted on ResearchGate:

If you’ve checked all of the above and your reads still aren’t being counted, you may want to reach out to ResearchGate support for further assistance.