Unrecognised Chat Thread in my account

[warm furnace]

Exactly as the title says, two chat threads appeared in my account, the first few inputs and outputs are not from me. The last message/s in each thread are however.

[hidden lichen]

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[short tree]

your account are likely compromised, it might be a good idea to change your password

also, check your machine for maware and remove sketchy extensions from the browser, if you have any