I really thought I was just getting too old for this shit, but apparently iOS 26 is having some major issues with its keyboard. Wrong letters appearing, autocorrect is having hallucinations and so on.
I'm on iOS 26 using Gboard, and it's completely broken with the eBay app. Not sure who's to blame though as Gboard on iOS has always been kinda buggy across several recent versions anyway.
iOS 26 initially broke something in touch detection, not just the keyboard. First time since iPhone OS 1.0. They seem to have gradually been fixing it.