That is weird isn't it? You take plenty of time to make your move and the instant you make it you realize you made a blunder.
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I'm just most probably playing too fast...
Try 1. Playing games with more time per player, or 2. Go to Settings>Live Chess>Confirm each move. Will help with analyzing moves, but takes more time per move, which shouldn't be too bad if you are playing rapid or daily.
But which slower time control?
I've just been missing obvious moves, where right after playing it I realize I made a mistake. Why is this so?