Please note that you wrote to the ResearchGate community, not to the RG team. However, it is not worth writing to the team. The Hirsch index is calculated automatically from the identified citations, and these identifications are also made automatically. Unfortunately, for various reasons the identification of citations is very often incomplete, and it is not possible to add citations "by hand". See also these discussions on missing citations (just a selection - this is one of the most frequently asked question in RG):
What made you answer to my complain? Do you really think your constatation of fact (" The Hirsch index is calculated automatically from the identified citations, and these identifications are also made automatically) is necessary? It is look like a teacher give a lesson to a bad egg student. Exactly this your so called "authomatic" calculation was made with broken calculator. Hello, my complain is addressed to replace this obviously broken calculator. Either or it need to take off option of "Stats" ( for reason of accuracy) or make it accurate. Don't you get it? Is there any logic in your thought? You're making fool of yourself - not helping.