Price changes by itself sometimes

This has happened 3 times now. I'm using Rules to add a % discount on all products. I'm using Commerce Price Savings Formatter module to display the savings neatly. In the last 6 months we've noticed that 3 times already the discounted price was listed as the original price and then it adds the discount on top of that...We've lost quite a bit of money already through this. The 3 times we've notice it, it wasn't on all the products, just on one product, and only one product variation...it's digital downloadably products. But everytime it was a different product, so I can't see any correlation here except that perhaps Commerce Price Savings Formatter module might be buggy or the problem comes in through my product variations?

Any help is appreciated!