I had a monty card in my inventory that didn't disappear after use. I wasn't sure if I was just sleep deprive and imagine things the first time, but I'm pretty sure this second time (I sleep 20 minutes in 20hs, so it was a possibility). It gave me CSC but the card was still there. I have it activate right now and I dont know if I should finish my quests as it would reward me extra CSCs.

I delete the card so my tired brain doesn't keep trying to use it and don't understanding what is going on.

Edit: Not sure if it matters or not, but the card was locked in my inventory at that moment.