That's either randomness (every random sequence has long strings of all-heads or all-tails) or cognitive bias (it always feels like the other side is getting treated better) or some combo of the two.

I don't mean to be glib or dismissive I'm just writing this rather hastily! and this is a pretty well-established finding, at least in my own head, having gone over I don't know how many thousands of these cases...

Edit: but if you want to link to specific cases where you feel like there was an asymmetry, I'd be happy to take a look.