Sorry for butting in.....For example, imho: Yesterday the bid/ask was apparently .009/.01 for a good part of the day (and close?), on what ended up being almost 3x average volume (30 days average).
Today for the longest time (2 hours or more?), the total shares traded was 6,000 (six thousand), yet the bid/ask was .0097/.0098.
I think it was Ren (or someone else) who had told me/us before why this occurs sometimes.
But looking at screenshots/print-screens of those two occurrences can offer an opportunity for head-scratching later, if one chooses to. I think that's what lrt65 was saying.
All JMHO