I had that happen to mine... after I backed into a tree I couldn't see through the back window, (it was at a 45 degree angle...
) I'd bet the same sort of thing happened to yours at some time. I've been running 285 on mine for 6 years & other than that, it hasn't had a problem.
Also 265/70 is a bit wider but also slightly smaller diameter, so not significantly heavier than OEM size, (mine came with 255/75). You'd probably have bigger weight variation within the OEM size depending on what brand you bought.
Having said that, I'd get the Terraflex if I had the money to throw at it,. Since I didn't, I got a nice cheap 2nd had OEM from someone who did!