Well, you’ve just pointed that out. But that was the OP’s point.

Checking, which, as I say, is very easy, trivial indeed, results in one of two outcomes: correct or incorrect. Your example is incorrect. Anyone can see that. It doesn’t need explaining. It’s simply incorrect. Although we don’t have all the information any other potential spend that contributed to the figure. Let’s assume that it is indeed incorrect.

The OP has a choice at this point. Contact corporate and have it fixed to the correct, lower, figure or be happy that they got more points than they should have. Generally, people only contact corporate to fix posts when they are lower than expected for obvious reasons.