I don't know. One way to find out is to see if the bug happens in single player. If it does, ENB Series is the likely culprit. If it doesn't, it may be an incompatibility with a shader or something else in MTA.
Install the latest patch of MTA:SA
Install the latest DirectX runtimes
Could you provide a dxdiag report? Press the Windows key + R, type dxdiag, press Enter, click Save all information... and post the contents of the saved log here within Code tags.