Modal input fields cause page jump to top of the page

[Jagster (Jakke Flemming)]

No, you aren’t alone. I think it’s this:

iOS 26 bugs with fixed position elements in Discourse

Update: with the release of iOS 26.1, Apple has solved the most critical bugs discussed in this topic. If you or your members are experiencing layout issues with Discourse on iOS, be sure the affected device is updated to 26.1 or later. iOS 26 has been officially released, but we recommend holding off on updating until some Safari issues are addressed. These are visual issues that cause fixed position elements on iPhones and iPads to be misplaced after opening the on-screen keybo…

So, 26.1 should help.