Prices change randomly

Hi, some days ago a customer purchased a product to a lower price. The product cost €?39 but he paid €?35. Moreover he paid shipping lower than the price (11,90 €?instead of 13,90 €).

I checked the page linked above and now prices are correct (€?26 custom drumsticks and € 39 vic firth drumsticks). Some minutes ago the price was lower of a couple of euros.

I never changed prices or added coupons. The system just did itself. It happened also in the past. How can we solve this?

I’m enclosing the System Status Report:

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