Tour of Duty Ticket not tradable and not marketable?

TL;DR I have a ToD in my inventory that is not tradable and not marketable. It's not the 1 week trade lock and I bought it from the official Steam market. Wth?

One and a half weeks ago I wanted to 'buy' Just Cause 2 for 1 ToD from someone on Steamtrades. He was a really nice person because I didn't have a ToD back then and he offered me to give me the game immediately and let me pay later once the 1 week trade lock for the ticket I wanted to buy from the market was over. So I bought the ticket and a red message appeared in the item's description telling me that it wouldn't be tradable or marketable until one week later - just like expected.

Now, one and a half weeks later it came to my mind that I didn't pay what I promised yet so I made a trade offer. But the ticket was not in my TF2 item list. I checked my inventory and the ticket was there, but it had 'not tradable' and 'not marketable' in the description. No red letters with a date (the week long trade lock was over a few days ago already). It looks just like any other regular item that can never be traded or sold on the market no matter what.

Why? This is completely ridiculous, I traded a lot of ToDs already and most importantly I bought that ticket on the official Steam market from a random Steam user. How is that even possible? Is it some kind of bug?

I would appreciate any info on this matter.