Animation issue - from the 21 day portfolio course

I’m just working through the 21 day portfolio course project, and making good progress. I just about have the hero animations working… but something isn’t right with the top left image in the grid of six. Not sure what’s up… if anyone can see what’s going on, that would be a great help. Thank you.

Weirdly, it seems OK in Firefox, but not Chrome or Safari (on a Mac running Big Sur). Also, the images look flatter at the end of the first animation, almost as though it might not be quite getting to the end in Safari or Chrome.

https://iain-macdonald-ux-portfolio.webflow.io/

https://preview.webflow.com/preview/iain-macdonald-ux-portfolio?utm_medium=preview_link&utm_source=designer&utm_content=iain-macdonald-ux-portfolio&preview=ea06ee6c28302de72c584f6d7aee9fa4&mode=preview

I ended up recreating it from scratch again, checking at every stage for the glitch. Seems to be working correctly this time.