I’m on Windows 10 in Reaper 6.15. This bug has happened to me a few times, butt it happens randomly and I can’t reproduce it. Sometimes, instead of being able to tweak the knobs, the edit value box shows up instead, despite me not accessing it through the right click menu.
If you hold alt while clicking it’ll open that menu but should disappear next time you click.
Is that what’s happening to you or are the edit boxes sticking?