Weird depth problem releated with AO and OpenGL

So, i was having that issue with Quake, and tought it was normal, turns out it isn't.

Basically , all of the games depth buffers were fine, but each time i enabled the AO, this noisy mess happened:


Depth outputs (First one is normal Depth Buffer output, second one is the Screen Space Normals):





Same result, this time on Quake:


Games tested:

Quake (Try the shareware copy + Darkplaces engine)
Re-Volt (Grab a copy somewhere on the web, its abandonware + download Re-Volt GL [RVGL])

This may happen on other OGL games, didn't try.

I also experienced the same problem, latest reshade in Kotor 2