Unfortunately, it might be both a glitch and bad rng. I'm sorry, but you'll have to grind for it again. I wish you good luck and good hunting.
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I mean I have a suspicion that the glitch is causing it not to drop. With the fact I can't buy it and I domt know why, I have the grimoire?
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I'm not sure if having the card is causing the drop rate to glitch out. It might. Or it might not. All I can suggest is to not give up on getting it to drop: use 3 of coins as much as possible, complete end game activities, and run the raids to maybe get some exotic drop chances. I'm sorry this is happening to you.