magic arrow

Could you explain this in simpler terms? What does it all mean?

Having an element also deals damage of that element (I made a mod – I changed the magic orb from fire to air). Magic arrows have an element, but its elemental damage, in this case fire, is removed by "DamageIsElemental>false".
And the fact that a Warlock deals additional elemental damage with a magic arrow, and it's written as "+123 Fire damage", I think should be considered a bug. It shouldn't be there. Or am I misunderstanding something?

Added after 6 hours 16 minutes

No element and no "DamageIsElemental" - magic fist (physical damage).

I added an element to the magic fist, but the damage remained physical, and additional elemental damage appeared on the Warlock.
Apparently, there are other parameters that I don't see, or they are hardcoded in the executable.