[1.2.377] New music. Changed Worldmaps.

They have to change due to how the Potential stats are stored.
When you Potential an item, it doesn't lookup the stat once and store "this weapon has 8% W.Atk".
It's a reference. When the level changes, the reference changes.

I'd be more concerned that you change the reference and make the item not only display incorrectly [i'm envisioning <null> everywhere], but possibly make it so when you try to view it pomegranate crashes due to referencing nonexisting values.