Hello I've just noticed this behaviour (never saw it before TU 1.6.0, but didn't used Gunnar that much)
PS4 pro
AC Valhalla TU 1.6.0
on internal SSD
Manual Cloud save = done
once you upgrade one weapon quality (didn't tested with clothes), after a certain amount of time the Gunnar's list will auto-scroll to the top
Reminder : This is Not a Major issue = this is more a hint for devs in case things may become worst (it has already been the case some months ago for some other platforms)