[GAMEPLAY] Multiple Sterak's Gages show incorrect AD

I don't know how to post a screenshot on here and it's kinda hard to explain but here's the scenario.

1. Buy at least two Sterak's Gages

I buy 6 Sterak's Gages on Mordekaiser and each one of them says that it increases my AD by +73 so 6*73=438 but my total AD is only 382. There is this same discrepancy when I buy at least two Sterak's Gages. The bug is probably not champion dependent because the same thing happens when I buy multiple Sterak's Gages on Gnar.