Wheel bends out on reverse

Hi all,

I don't know which section to post this but as I am new to Caravaning then maybe this is the best place to leave my post. 

A strange thing happened with the twin axel when reversing into storage today. Reversed between two vans and when the van was on a pretty extreme angle where the front of the van was nearly touching the back of the car then the furthest near side wheel bend out a couple of inches. I unhooked and straightened up with the motor mover. Then the said wheel lined up to normal. Only had the twin axel a couple of months.