Your Steam account is under scammer's control and you really need to read https://forums.steamrep.com/pages/hijacking/ and follow the steps there
So here’s the story of what happened: So I was sent a trade response from someone who wanted to buy my Miami nights fur lined fighter. As I went into confirmations, a confirmation that appeared to be from that person was there, so I confirmed the trade. But as I accepted the trade, i realized that there were no items on his end. By the time that happened it was too late.
Here’s the request (this person had impersonated the person in the second picture, and had almost immediately changed his name after scamming me)
Photo of scammers trade req:
Photo of legit trade that I meant to accept:
Did you have any interaction with this user or anyone else regarding this trade? If you did please provide
- Uncropped and Unedited screenshots of your complete chat on the steam client with that user.
If you don't have un-cropped versions find them here on this page https://help.steampowered.com/en/accountdata/GetFriendMessagesLog
- Please find them on a web browser and hover your mouse over the username of the account in at least one of the pictures, so we can see the URL at the bottom left corner of the screen.
Example- should look like this https://imgur.com/a/ImcDuhP
I am a bit confused here? Who exactly did you chat with? Please provide their steam profile link. I believe the will be linked with the user you had a chat with
Also you have been phised so you surely did have a conversation with someone in the past from which they lead you to a random website with steam login.
Did anything of that sort happen? The accused must have gained access to your account somehow, this is not a bug but a clear example of phishing
I will also need the chat logs in the requested format above
Closing due to lack of follow up. You can reopen this yourself if you would like to add the required evidence.
A guide on reporting can be found here - https://forums.backpack.tf/topic/53663-guide-for-reporting-on-the-main-site/