I find this puzzling.
You’ve got a small leftover track segment uder the pad 4 where the red arrow points to. You can for example use the Layers Manager/Items to hide all footprints to see it.
I like to show pads in outline and sometimes tracks too, to make it easier to see these track fragments
That’s an easier trick.
It’s possible to make pads semi-transparent which makes it easier to see tracks behind copper pads, but holes are opaque black. I added a wishlist bug report for making it configurable. https://bugs.launchpad.net/kicad/+bug/1840177
Yes. That is what I too would suspect at the very outset.
Try deleting orphan tracks. Edit–> Clean up tracks and Vias
Guess your problem would vanish.
The Items panel on the right hand side too is phenomenal… The other day, I was searching for micros and all it took me to Hide all items except Micros 10 secs., I caught hold of the last Micro I was desperately looking for