Colors wash out after exporting video

Hello!
I have been turning Prezi presentations into videos for a while but last time I tried (this was a few days ago), once I save the video, all colors in my presentation appear washed out and some graphics are almost impossible to see.
I also tried downloading the video from Prezi online instead of from the app and the quality is a bit worse but the colors stay… but then when I edit the video (put music and voice) with my editing software, the colors come out washed out again! So I think it is a problem of the graphics coming out of Prezi?
This never happened before with my other videos, which I did exactly in the same way and the same graphics.
Thanks in advance for your support.

Hi @Ivo_Franschitz, could you please send me screenshots where I can see this difference?

Could you also record a short 15-20 seconds video that you could share with us so we can investigate the issue?

You can use wetransfer.com to send the files to me, please make sure to create a transfer link instead of sending me an email.