Ask HN: Weird Credit Card Stuff

I’ve been noticing weird charges on my credit card. Shortly after I receive them I get a negative credit for the same amount, resulting in 0.

Also the dates on line items change.

I’ve worked in software for in house payment processing. I know it’s complicated, and weird stuff can happen.

What would explain behavior like this?

It never ends up costing me anything, so I feel it’s a waste of time to pursue.