Phantom doing circles on the spot

[Dazzauk]

Twice now my phantom started doing circles on the spot.

After noticing it the second time I re calibrated the compass.

Anyone have any ideas. It's very strange ??

 

[Meta4]

It's called toilet bowl effect.
If it happens everywhere it's a sign of bad compass calibration.
If so, get a good compass calibration and don't mess with your compass

If it just happens in one area you are close above a lot of steel.
If so, it should disappear when you get away from the magnetic influence of the steel.