Apparently it is not a fake statistics.

HIV infection among heterosexuals have come down, but there is a spike in Homosexuals worldwide, Malaysia included.

The summary of why it is like that - small pool of people sleeping and having sex with each other.

A heterosexual man with a large pool of woman, statistically the infection chance is lower (also due to less risky vaginal sex).

A homosexual man with small pool of homosexual man, the chances are higher.