In my experience it’s always the males who do the most aggressive biffing. Although a grumpy female might push another hog out of the way, but it’s very mild compared to the way the males behave. I have occasionally seen a male biffing a female, but I think it was just when he was getting a bit carried away biffing every hog in sight and, perhaps just for a moment, didn’t realise it was a female. Not sure how impressed she would have been with him afterwards!
As said (nearly two years ago! How time flies!) hedgehogs have ranges, rather than territories, as such. But males, in particular, will protect their personal space, which leads to these biffing sessions. In the normal course of events hogs probably wouldn’t meet so often, but are more likely to meet when they visit feeding stations.
These biffing sessions don’t seem to do the hogs any harm, especially if the more submissive one rolls up immediately.