Sometimes my ping is high ( I can feel it not ingame indicator ) and then I click new monolith multiple times due to the game being not reponsive. I logout, log in and the modifiers stack like this. And it not just visual bug, those modifier actually stack. In my case the mod was high health enemy take 25% less dmg. this results in they take significantly low dmg until they arent high health anymore.
I have the same kind of issue, not sure it is linked to ping. One of the modifier has just been tripled when i did an echo