Hi Eve,
I recently got a new iPhone (12) with IOS 15, and I noticed it reacts very differently for drop down menus (like in the breeding center) than my previous iPhone (7) which ran 14.7. Previously I got a “picker” style menu that ran the width of my phone. Now it’s an odd, squeezed, centered pop up menu. I called Apple and they said this was a lack of website compatibility for the new IOS (although I personally have my doubts.) Do you know if there is a solution? I imagine you don’t update the code every time a new phone version comes out. Below are screenshots.
Thanks!

Old: beveled drop down selects, and when you click on them you get a picker-style menu that makes the current horse darker, so it's easy to scroll/select. Menu is full length and at the bottom.

New: drop down selects are rounded for some reason with less obvious drop down selections, and when you click on them you get a white pop up with no differentiation (and is very hard on the eyes) with multiple lines per horse. It also covers the original thing you clicked on to get to the drop-down.

I have this to on my iPad

I have issues with it on other websites not just HEE.

Same but mine are all on desktop-only sites

Have you tried a different browser and have you checked your phone's setting for webpage view/scrolling?

Yep, I've checked safari, firefox, and chrome. Apple support said there aren't any iPhone webpage settings that can fix it.