Yep, that happens to me too. And my hair can look different half an hour later in the SAME mirror! My hair just changes from minute to minute - I think that's why I have no luck with hard-hold products, it tries to change, can't and so looks weird.

If I find it looking good in one mirror I tell myself that's how it REALLY looks, and all other mirrors for that day are just bad mirrors...I struggle to keep believing that though!