One frame offset when stopping / setting in or out points

[SHERPAH]

Hi there!

I have a problem on Premiere Pro. It's been a while since the problem began to occur, and I'm fed up with this so I would like to know if anyone has a fix for this problem.... 

When stopping the playhead, setting in or out point, Premiere actually waits a few seconds before before moving one frame ahead.

If I try to set an in point at the exact junction between two pre-edited clips in a master file, the in point will be offset 1-frame....

So each time, I need to correct the exact frame I need to stop at, or set the in/out point at.

See the screen capture here in attachment.

Working on mac pros / Mojave, with CC2020 latest release, but I've been striggling with this problem since 2 or 3 years now, I think...

The problem occurs with all kind of footage. From low res h264 to RedRaw, Prores4444 and so on....

Can anyone help? Any idea on wher the problem can comme from? Any fix?

Thanks

[SHERPAH]

I forgot to mention that I tried without any timeline information displayed (waveform, clip names and so on...) as well as changing the location of media caches / peak files to my system drive or another local drive...) The problem remains.