How come...
 

How come, you can spend ages trying to get all four wheels at as close to -1 degree camber as possible, set it perfectly, but when you check it again an hour later its it some stupid angle like +5 degrees camber. Been happening to me for the last two day. whenever i come back, it seems to have changed.

Suspension sag causing camber gain, bounce the car to settle before setting up.

wheels aren't straight so different reading every turn of the wheel

Badly glued up tyres not running true?

Checking at different ride heights (as above)?

Bent axles?

Suspension components worn?

Ball joints worn?

Hub bearings worn?

Buckled wheels?

Checking on an uneven surface?


Just some things to look for.