Fix prestashop problem on product page

I've upgraded my prestashop store to 1.6 from 1.5. I've manually moved the database tables to my new store. The problem: Products that had price reduction in my previous shop version, and now doesn't have reduction are showing the original prices and next to it the original prices crossed again (like it's reduced, but it isn't). It's like that (the smaller price is the price without tax, it's not relevant): [login to view URL] And it should be like that: [login to view URL] In the back office there is no reduction to these products, they are not in the database, in the ps_specific_price table, and they are not on sale. I assume that's some kind of problem occured when I've imported the database tables, becouse these products were reduced on my previous version. I need someone who could fix this. Thanks! Gergő