Strange, i cannot reproduce your issue during typing this answer. Could it depend on the depth of the thread perhaps?
OK, testing at this level, then (I think that was the level I saw it earlier today)
No, it seems OK at the moment. Let's try another two-way on this reply set and also test from the other Reply link, to see whether it occurs elsewhere. If not, I'll have to think it's something stale in Chrome again. I do find I have to re-start Chrome occasionally.