This keeps coming up PRE-market:
At the end of each trading session, and after, many/most bid/asks drop off and/or are cancelled.
It can take a few minutes after each trading session opens for bid/asks to get into play (even though many are submitted a little before the session begins, others are submitted after).
Such 'wide spreads' simply RE-flect the status(es) at various points in time --- nothing to worry about here (UN-less there is some "imminent news").
And then, throughout the trading session(s), 'people' are submitting and cancelling orders "dynamically". (Or is it "DIE"-namically.)