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I have a bad feeling the shifter has had it.
This is an issue with these shifters (It happened to my old campag Xenons years ago) where the plastic rachet wears out:
Quick Google gets this
https://bicycles.stackexchange.com/questions/29860/rear-derailleur-shifts-all-gears-at-onceI'm sure there are diy solutions for those brave enough to try, but it may be a project of diminishing returns
nomoreknees
@swmlon
No issues going to the cassette other than the occasional missed shift due to use error. But lightly press the thumb shifter and it goes all the way to the 11t cog