I have a 4K monitor. With VLC 2.x that I used before, there was no problem. Now I upgraded to VLC version 3. The problem is the following:
Windowed mode works fine, subtitles display on bottom. Changing the sub position doesnt seem to do anything, but no matter.
When I go full screen on my 4K-monitor, the subtitles move to the top. This didn't happen on VLC 2.x
Full screen on my normal-sized 1980x1080 monitor is fine.
Edit: This was on 3.0.2 x64 for Windows