how to recreate the issue?
1. download a multi touch tester app I used this
2. first do some testing yourself see if you can spot the issue
3. now do 3 finger swipe down (phone will take screenshot)
4. now randomly touch your screen with 1 or 2 fingers you'll notice 1 or 2 ghost touches.
How to fix Fix it?
1. go to settings>additional settings>button and gesture shortcuts>take a screenshot
2. and set it to none.
the issue should be fixed
please let me know whether this worked for you or not