Here's my random guess; it's downloading broken/corrupt pieces.
I've often gone slightly above the amount of the total download. 175 for a 172.5 mb file and so on. However, never to the extent where it's 100's or even 10's of megabytes. That is sincerely worrying.
Also, make sure that Bitcomet is displaying files in terms of megabyte size rather than megabit size as some clients tend to do until you change it in the options.
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Dear cousin choppitychop89, you were a good relative, though I hardly knew ye.
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