Last pulled doesn't correspond with incrementing pull count

I am trying to get an accurate count of how many times my docker image has been pulled. I frequently see the pulled field resetting to something like ‘2hrs’ ago, but this doesn’t correspond do an increment in the pulled count. Is this feature not working or am I misunderstanding something?

image for reference: Docker

I’ve observed this for awhile now, so I don’t think it’s an issue of them being updated on different schedules. I see the last pulled resetting usually around 10 times before I see count increment once.

Any pointers is greatly appreciated. Thanks.