Originally Posted by
Kelrugem
I just tested and the boni are correct then, +1 atk and +1 dmg; the masterwork in the properties will not stack with the bonus in the bonus field, and technically speaking such weapons are masterwork (but there should be not this stacking issue) :)
But I was able to reproduce that problem: When you use this item generator then these items are unidentified at the beginning. When you give someone an unidentified +1 longsword, then that character will get the +1 atk bonus by the masterwork property. After identifying that sword there will be suddenly an additional +1 atk bonus by the magical bonus, hence suddenly these stack. So, the workaround is to identify the sword before you apply it to someone (or to remove the masterwork property though magical weapons normally have this property, too)
By the way, I have this bug even without that extension, thence, it is a problem with FG itself :D If you want you can open a separate bug thread for that :) Normally FG checks that masterwork and enhancement bonus are not stacking but seemingly not when the item is unidentified when applied