Thank you for your quick reply! I've been trying to figure this out for about a week. I continue to get that "squeeze" from images taken on a Micro-four thirds camera, GH-5, but not on the full-frame images taken from a Nikon DSLR. Sure appreciate your suggestions and help!
My System: Lr-Classic 10.1, Lightroom 4.1, Mac - macOS Big Sur, v11.1
I just completed a session with a client, & after sharing the link with their photos they brought up this same distorted look. All of the photos in the link appear squeezed or stretched either in the horizontal of vertical axis. I've called Adobe Support twice, & both times I have them remote access to my computer & they were unable to solve the issue. I hope someone fixes this soon.
It would greatly help if you could show us an example of the problem that you are seeing. I've got plenty of images from an MFT camera in shared albums, and no issue at all in how they are displayed. Is the problem with the previews in the grid, or when displaying invididual images? Maybe create an album with a few test images in them and share the link here? Or take and post some screenshots, though a shared link would perhaps be better.