Yes, if you entered your login credentials there your account may be compromised.

Try changing all your security data (password, secret question, etc) while the hacker has not done any harm to it yet (stolen items, used it to phish other people, etc).

Objectors are being used by many people to advertise, attract attention or even troll the trades. The simple fact of listing an objector not for sale is enough for a bunch of people to report your trade.

As Xile{7} said, the item is not for sale. For such cases I recommend used the generic "Game" icon, or any other CS:GO related icon, as a TF2 weapon/item has nothing to do with what you are selling.

Did you write in your appeal page?

RUS|GENERAL lähetti viestin:

unban my account please. i was not traded some times and changed my inventory to private to avoid unnecessary questions and turned off autobump in outpost. and to my surprise was banned :O

♙t༼ຈل͜ຈ༽ށ lähetti viestin:

User rule 5: No private profiles or private backpacks — not only is it suspicious, but it also prevents the website from functioning properly.
Just make your profile public then the ban will most likely be lifted.

Let me give an example:

One can list 8 tokens, 7 tokens and a craft hat icon, or just a single craft hat icon on the wishlist. All these can represent "buying all craft hats", there's no need to open 1 trade for each class.

But selling is a different matter, because you can't "represent" all the items you are selling with a single icon, unless you have at least one of each hat - in this case you could use the craft hat icon on the left side.

There's no history available for that item, sorry.

I find such feature very hard to maintain without a monthly fee. Donations would not be enough. And the fee wouldn't be low either. Probably a couple staff members would need to oversee these bots 24/7, and that can't be done without a paycheck.

Can you access your appeal page in TF2OP?

The relist rule currently has a lot of gray areas.. and this case is a classic example of ambiguity.

Being verified or not does not make any difference when it comes to chargebacks.

From PayPal page: "When you’re Verified, it means that you’ve provided a little more information about yourself to help confirm your identity."