Ok, so I have a PRS Custom 24 and I love it. There is one problem though...
Whenever I use the whammy bar, my G string goes out of tune. I have guitars where this is an issue occasionally (most notably on my PRS SE Custom) but never does the string become SHARP (raising above the desired pitch) as opposed to becoming flat (being below the desired pitch)

Is this a result of its having locking tuners? Or have I strung it wrong...? I don't remember if this issue was present when I bought the guitar (it was strung then, obviously) but if it was, it wasn't as prominent as it is now after having been strung by me.

Here's a link (and a picture, for that matter) of my PRS


Thanks for any help