What would cause this: £350

[nylyon]

I created a test machine to test the 4.0.x upgrade and ran into something which I don't know is a bug or some configuration somewhere.  On my production site, I see a post with that contains this string: £350, however in the upgraded test area it is Â£350 and I am not sure which process may have caused that.  I suspect it's not the upgrade, but any help with the cause would be great.

[RazorSEdge]

It probably has to do with the way text is stored now and such.  For example I had a ton of weird symbols and letters throughout posts and other areas such as privacy policy etc.  I cleaned up the policies/guidelines but left the posts alone (not going through all of those).