2xOmen + Annul from stash = double effect?! Please Help!

My Oblivion Mark gemini bow had these mods:
+Phys Damage %
+Phys Damage % & Accy
+Accy
+Crit Rate (Fractured)
+Dex
+Lower Requirements

My goal was to use omens of Dextral Annulment + Greater Annulment to remove the +Dex and +LowerReq suffixes (I'd been whittling/dextraling these suffixes over the last few days trying to get two good ones at once).

I had the two omens active in my inventory, spent 1 Annul from my stash, saw the omen confirmations in chat, and then (assuming it had worked correctly) spent 2 exalts on the bow.

What I have now is:
Prefix:
+Accy
+Lightning Damage
Suffix:
+Crit Rate (Fractured)
+Crit Dmg

So it looks like somehow, using those 2 omens + an annul from my stash caused the Annulment affect to apply 4 times instead of 2?! This basically bricked my bow :(

Please help!