Images from a synced Lightroom Classic (12.3) collection appear distorted (vertically squashed) when viewed in the generated web gallery. This is consistent across browsers, devices, OS (but working primarily on Mac 13.3.1 and iOS 16.2). I saw that there was a similar discussion from June 2022 but the proposed solution (check the metadate projection field for equirectangular) did not resolve the issue. Interestingly, when I access the collection on a mobile device, the images are distorted in the collection there (not just a generated web gallery). However when I hard press on an image (a gesture that typically shows before/after states) the original unedited image briefly appears (as expected) but when it pops back to the current state, the distortion is gone.
For background, these images were shot on a Sony a7iii with the aspect ratio accidentally set to 16:9 (versus the native sensor 3:2). Once imported I batch reset the crop to include the whole sensor capture. I did this by adjusting one image and syncing the crop settings across the others.
Oddly when the image "pops" back to undistorted in the mobile app, it returns to the 16:9 crop.