ResearchGate also displays and counts self-citations. But it provides two values of the h-index in the stats section (https://www.researchgate.net/profile/Mustafa-Younis/stats in your case), one including and one excluding self-citations. In your case, both are identical. For Thokozani Mzumara (https://www.researchgate.net/profile/Thokozani-Mzumara/stats) as well as for me, the two values differ.
Wolfgang R. Dick compared with my Google Scholar profile; there is a difference. Google Scholar https://scholar.google.com/citations?user=ysBlVL0AAAAJ&hl=en versus https://www.researchgate.net/profile/Thokozani-Mzumara/stats?_tp=eyJjb250ZXh0Ijp7ImZpcnN0UGFnZSI6InF1ZXN0aW9uIiwicGFnZSI6InF1ZXN0aW9uIiwicG9zaXRpb24iOiJwYWdlQ29udGVudCJ9fQ