That's because bid support providers use DAY ONLY instead of GTC, giving sellers and greedy MM's a chance to drop the ask.
Oh chit it's going to .0001!!!
.0018x.002 about to break resistance!!!
We're heading for pennyland!!!
No, wait, nickelland, pick up some more!!!
It's going to a friggin DOLLAR, weeeeeeeeee!!!
BS bid whacking and it's a good buying opportunity!!!