Certain stocks were put into a trial program where the bid/ask spread was limited to $0.05 increments. The reality is MM are able to trade between the 5 cent increments while retailers were stuck with those increments. As far as I know no retailers had their orders filled in the in between ranges.
It's one of the reasons why this was trading 1.10/1.15 - 1.15/1.20 - 1.25-1.30 but orders were getting filled for someone between the bid/ask spread.
It is, was, and forever will be, a horrible idea for any stock.
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