Please note that you wrote to the RG community, not to the RG staff. However, if this concerns one of your own publications, you have to correct this yourself. See "A researcher has wrongly claimed co-authorship of my publication" in https://explore.researchgate.net/display/support/Authorship for instructions how to correct. But unlike this help page suggests, most probably it was not the other author himself who wrongly claimed co-authorship, but ResearchGate's automatic algorithm wrongly identified another researcher as co-author and assigned the publication to his profile. This is a frequent problem in ResearchGate in case of similar names or for other reasons.

Thanks