Item Tax Template on Sale Invoice

Hi, I am experiencing an issue where items with Tax Template 1 have Tax Template 2 set on a Sales Invoice, if I go check the item I can see that the only Tax Template it has is Tax Template 1. If I try to save the Sales Invoice I get an error message for every item line that should be using Tax Template 1 but has Tax Template 2 set for some reason unknown to me. The error would Line #5 Incorrect Tax Template for 10005. Anyone else encounter the same? Please help. Thanks