Fixed my trades disappearing?

Device: PC
Browser: Chrome
OS: Windows 10

Half a week ago, I posted a few trades, and I got notifications from people inquiring about some of them. However, when I click on the notifications they all take me to a page that says "The requested topic does not exist.." Anyone know what's going on here? Do trades get deleted after a certain short period of time?

Update: Now those trades I posted have disappeared altogether lol. I don't even see them on my profile anymore! So can someone confirm, does that mean trades get deleted after a certain period of time?

Gotcha, thanks! What's weird though is that I'm pretty sure they disappeared prior to one week. And three of them had views/comments within only a few days prior to disappearing.

For me they keep disappearing all the time from the trades list.
Then they randomly re appear later.

I had a 50%MF

War Traveler trade, it doesn't appear in my stash or via search. I bump my trades every day, two or three times.