Because it is not really stative, I suppose. In any case, it is common to put 'guess' into progressive aspect for immediate situations.
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
cho7712The word 'guess' is thought to be the one of the classification 'stative verb'That's surprising. I would not have said that 'guess' is stative.