I switched to my alt about 15 minutes ago; the first thing I noticed was that the cargo hold was not empty, when it should have been.
When I looked it was a 20 slots cargo without a fee mentioned, therefore a NPC mission; however I did not have any matching mission, nor should I have.
I went to deliver whatever it was, which told me that I had it for about 10 and half hours, but still gave me no clue where that came from; I am pretty adamant that I had no pending delivery mission of any kind when I left my alt earlier on.
I have no more information, but you might find it from logs, if there are any on your end.
The only thing I can think about is that somehow, someone else’s mission (not from my main either) was left to my alt to deliver instead…
Note: when trying to post this, I get a stupid message about a daily limit, and wait 9 hours before posting it… this is absolutely ridiculous to place quotas on bug reports…
… eventually, several hours later