Something might be wrong with biome spread. Does anyone else have this problem?

Xakk

Eye of Cthulhu
I was looking along my hallowed tunnel earlier this week, and this showed up on my map:
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I know this isn't a altar seed; it's been a while since I broke my altars. This has been happening all over my world; Coruption, Crimson, and Hallowed are jumping across tunnels at random, spreading willy nilly. Does anyone else have this problem?
 
Well, this sort of thing happens if you miss even a single Hallowed/Corrupt block when cleaning out areas.
But, there's not a huge amount of info you've given to give a proper answer.
 
Many of the perimeter breaches I'e been experiencing have happened across tunnels five or more blocks across, even though it's known that the limit to spread distance is three blocks, perhaps four on a diagonal. It seems that the biomes are stretching across distances they shouldn't be able to reach, infecting blocks well out of the way. The only explanation I can think of is that the range increases during a Blood Moon.
 
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