Front wheel alignment changed

Well, I've gone from having a RZR that had perfect toe in/toe out and steering alignment from new, to a RZR which now only goes straight if you turn the stering wheel a little to the right.

So I guess the tie rod ends now need adjustment. But rather than be somebody that simply fixes the situation and thinks nothing more of it, I'd like to know what are the possible causes of the steering going out of alignment?

FWIW - I recently added the front hub washers as per the service bulletin, as well as taking the hubs off to check all was fine. However, I'm not certain if this was exactly when the steering first went off-centre. And I don't see how popping the hubs off or adding washers both sides would make such a big difference - unless I've screwed up somewhere.

I guess I may have gone over a heavy rock in the snow - but I certainly don't remember any major jolts of late. Any other ideas?

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Check the tie rods and tie rod ends for bends. Common cause of toe problems.