After unwrapping my UV’s I noticed they are backwards. I tried “recalculate normals” and "flip normals” then unwrapped again but they are still backwards.
Any ideas what I can do?
in the UV editor window select all points and scale by -1 on the X axis (S X -1) or mirror on the X axis (Ctrl+M / X)
I found the “Mirror” option before I had a chance to reply but thanks so much anyways. 
I’ve had this happen a couple of times recently, but I don’t recall it happening last year, the last time I did a lot of unwrapping. Is this a bug?
I was using Blender 2.66 so not sure if it’s a bug, but more recent versions may not have this problem.
I’m using 2.67b and it happened a couple of times in the last week. Perhaps it’s a feature. 
The best and quickest way to fix flipped UV maps is scale your OBJECT to -1 as long as it’s symmetrical (not right or left handed).
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No, it isnt. And it’s actually not a good idea to do that.
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You’re answering a question that was asked 11 years ago, so I think by now they probably worked it out.
