If you don't feel you're double-clicking and it's showing that event anyway, I wouldn't rule out a mouse issue. As microswitches age the metal contacts within them begin to wobble and bounce on the contact. Various OSes have software to try to correct for this that they call a debouncer but it's not perfect. Eventually the only solution is to replace the switch as it begins creating double-clicks events too frequently to ignore.
I only bring this up because I've had the same mouse for around 16 years and I have to replace the LMB microswitch every 2-3 years to keep it going. If you have a spare mouse or want to check a different button to test this, it's worth considering.