i have some issue with product price list

hi there
when i edit my product new price at backend is work fine, but at frontend it will show old price? and when i add to cart the product price will changing to new price?

And i also have try clean all the cache also same, and when i off atum plugin the product price is work fine, when i on back atum plugin the product will change back to old price.

can i know how to fix this issue?