Video export is out of sync, with NO variable framerate

I’ve seen many people saying that their export got out of sync, and most of the time it seemed because people were doing a montage with clips which had variable framerate.

But that is not my case. All the clips I use have a stable 10 fps (as seen in the properties panel).

So what do I do ? :slightly_frowning_face:

thx for your help

Can you share some screenshots? Maybe they will spark some ideas. Properties panel, export settings, Video mode, timeline, etc.