Harbinger of the Seas not working

Gunmix25

Harbinger of the seas from the PMA 2 set isn't working as intended. When a player converts any non-blue gems convert them into blue gems instead. This isn't happening. In some cases standard conversion occurs and nothing else visually appears but if I check the PW, in this case Greg, i can see all the mana bonuses are gone as intended. But this doesn't always happen. Imho i think this only triggers if greg converts gems into black gems.

Gunmix25

Edit*** whenever ANY color conversion occurs, nothing changes to blue. But the opponent does still lose all of his mana bonuses.