Footprints are changed between Footprint and PCB editor

No, I can not see that on your screenshot. I can see some grid, but I don’t know what resolution it is. The discrepancy seems to be compatible with a 1mm grid in the footprint editor and a 2.54mm grid in the PCB editor but there is no way to be sure from the cropped screenshots you posted.

It’s very easy / quick to zoom in or out in KiCad and a scale of 1:1 does not make much sense anyway. Combine those and it’s very easy to loose track of your overall scale. KiCad has several measurement tools

  • Numbers in the bottom info bar (reset the dx and dy with the spacebar)
  • Ruler.
  • Dimensions you can put on the PCB in an auxillary user layer.

And you can occasionally print your project on paper to get a grip on the scale. I recently bought a bunch of uC’s in TSSOP20 and SMPS IC’s in sot23-6 and now my 0805 resistors suddenly look huge. A stray DIP-8 has suddenly become extremely Godzilla like.