Has anyone ever had a global upgrade certificate gone missing? I applied my fourth one to a flight a couple of weeks ago but the upgrade never cleared.

So, I went to use it on another flight and now Delta is claiming that upgrade did clear and I don't have any certificates left. Thankfully, the supervisor took pity on me and allowed me to upgrade with miles.

Has anyone else experienced this? I keep my boarding passes for a reason. Seeing as the fourth certificate expires shortly anyway it doesn't matter much, though I suppose it does matter to prove just how bad Delta's IT is.