Error after exporting, Video & Audio not synched (different framerates 50fps, 25fps)

Hi all!

I'm now in the middle of editing my first Music Video in Premiere Pro 2020 and have the following issue: 

I acidently recorded most of my 'performance' shots at 50fps. Now I have both 25fps and 50fps clips into the same sequence synchronized up with the song.

When I view the edit in Premiere Pro everyting plays at 'normal speed' (which I want) But once I export the file most of my 60fps shots are speeded up. When I searched for an answer I could only find solutions where the video is slowed down. I don't want that for the performance shots otherwise the audio isn't synchronized with the video.

How do I export my edit and make sure the video plays at 'normal speed' and with the audio syncronized once I view it outside of premiere pro?

How do I make sure my 50fps videos play at normal speed (just like the 25fps videos) after exporting?