I also have the same issue.
I recently changed my profile picture and on windy.com my profile the new photo is there but on the Windy app the old one remains.
I have logged out and back in but to no avail, have I missed something?
Have tried logging in and out, different browsers, clearing cache but the problem still persists.
It seems to me that the issue is related to the profile picture in the app and not community.windy.com.