I’m confused

Not letting me use full 140 char for RT

Occasionally, usually when I'm retweeting and have edited to get below 140 char, when I tweet it tells me 140 char max. Even though in the editing window it tells me I have 0, 1 or 2 char left...I usually have to back it down a couple more to get it to send. (I think this may only happen when doing scheduled, but not sure.)
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