Errors

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When you reply to a thread, it makes the thread title your subject but it sticks 4 extra characters, "RE: ", on to the beginning. So when you try to reply, your post subject is actually "RE: A new challenger approaches! (Meh, I bet that's the 5000th time you've heard that...)", which is 85 + 4 = 89 characters.

So it didn't miscalculate

Haha, didn't think of that. I mean, it's not like we were actually really using post titles so it's rather stupid anyways. They cannot be changed and nothing.
Let me say that's a realyl dumb implementation then when they don't just cut off the overflowing characters automatically.