Missing profile photo information, changed format
When you upload a profile photo, there is no information about the actual size in pixels x pixels, which is crucial when you use PNG og GIF files for crispness. Earlier, the size seemed to be 320 x 320 pixels.
The format has also changed from square to something like 4:3 (width to height), so the bottom part of your old profile photo/image from before the latest change has been cut off.
In addition, it seems impossible to get the same brightness in colours, as if there is some strange colour management or conversion.
It would be nice to have some specific updated information on how to get it right.

