Am I missing something here? I count the total number of net beneficial decisions to be 22, and total number of net disadvantageous decisions to be 21.

Shouldn’t both totals be the same number? When one team gets a beneficial decision, it can only happen at the expense of another team (i.e. it’s a zero-sum game).

I could understand the discrepancy if this analysis were counting games in other competitions, but this is only counting Premier games so I would expect equal totals.