Spells: Necro Spells -100 to -200 modifier spells resist frequency.

[Uteunayr]

If I remember correctly, they put in a static 1% resist chance on all spells, regardless of a resist modifier. It is still possible that two 1% chances happen back to back.

Possibly check your log and check the resist rate on spells verus overall casts? It may be that you're just noticing the silliness that lifetap like spells, a spell often in classic sources referred to as "unresistable" can be resisted 1% of the time by green cons, lol.