Malc, try shooting back to back in normal firmware and CHDK at the same exposure times, so 15secs.
15 in normal and 50 in CHDK won't tell us a lot.
If they are both fine at 15secs, but a problem at 50, then it is most likely amp glow as people have suggested but if it still shows up at 15secs but only in CHDK mode, then there is something wrong with that specifically.
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