Originally posted by ♥K:

i sent my friend a trade offer with about 50e worth of skins, but somehow someone else got the trade. how is that possible

Secure your account. All steps...

Scan for malware. https://www.malwarebytes.com/ or with whatever.

Deauthorize all devices https://steamhost.cn/twofactor/manage

Change your password on a secure device.

Generate new back up codes. https://steamhost.cn/twofactor/manage

Revoke the api key (this should be empty) https://steamhost.cn/steamcommunity_com/dev/apikey

Read the Steam Item Restoration Policy.

Originally posted by ♥K:

i sent my friend a trade offer with about 50e worth of skins, but somehow someone else got the trade. how is that possible

You gave away your account credentials and someone set up a bot to cancel your trade and redirect it to them. In short, you were scammed.

Do the steps posted above. All of them.

Steam Support will not restore lost items.

Your account is compromised by the scammers... they do a bait and switch withj your account...

At some Point in the mfuture you WILLINGLY gave the Steam credentials away to a scamsite in the hope to do some trading... that site PHISHED your credential..