When you tap the list title in this yellow area in the Reminders app, the rows shift in an awkward/undesirable way. This may be a problem specific to older iPhone versions 12-15.
Visual glitch of Reminders-App (iOS 26.1)
You should raise this as a bug in the usual way. It won't really get progressed if it's only posted in these Developer Forums. Especially given we aren't Apple's actual developers; we're just random people from around the world writing apps for Apple's platforms. These Developer Forums are for us to ask for hints and tips on coding.
You need to raise each issue you find separately at https://feedbackassistant.apple.com/ You can post the FB numbers here if you want, so that others can track them.