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If all of the flats bar one are around the 30k mark then that one outliner shouldn't have much of an effect. Technically you can do flats with 10.5k ADU value but you need to take a lot more of them to get the same quality.
If it was the first one that had the issue, it could have just been a random issue that caused it. No idea what but maybe a mistimed exposure or something.
I wouldn't mind seeing a properly stretched one (running a DDP) to see the full range. Looking at the shape (not round) I have a feeling that you may not be getting even illumination. This will cause your flats to do more harm than good. Over correcting in some parts and under correcting in others.
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