The most common cause of unexpected tokens appearing in your wallet without your authorization is an airdropped scam token. Bad actors send these tokens to wallets automatically.
They may even look like a similar coin you just bought, that is by design in hopes that you make the mistake and interact with it. They are not real transactions from your account.
Do not interact with, sell, or approve any transaction involving tokens you did not buy.
If real funds left your wallet or tokens were sold and you did not do it, it is worth pausing before adding anything else to that wallet until it has been looked at.
A transfer like that was signed with your wallet's private key by something other than a trade, send or withdrawal you started in fomo.
The ways that happens are a key that was exported and typed into a site, form or app, a key stored on a device or in an account someone else got into, a key shared with someone, a request signed on a phishing site, or a browser extension or bookmarklet that ran while you were signed in.
When you contact support, it helps to tell us whether you have ever exported your key, where it may have been entered, whether anyone else has used a device or browser you were signed in on, and whether you have seen a sign-in you did not recognise.
fomo is a non-custodial platform. No one at fomo has access to your private keys or the ability to reverse any on-chain transaction. Once a transaction is confirmed on the blockchain, it cannot be undone by anyone.
If you believe your wallet has been compromised, contact support immediately.