The standard grid in the schematic editor if 50mil.
It’s a trap that many newbies get caught in, while people the old farts have fallen into habits that “work” and have forgotten it could ever be a problem.
I don’t really understand why it’s even possible to change the grid (at least for schematic symbols, wires and labels) in the schematic editor. But at least it’s relatively easy to repair in KiCad V6. Just a few hours ago I wrote down a short tutorial on how to do so for another user in the link below.