they told me it was due to interaction with the app because before that I had sold some NFTs but the 1000 dogen that I received from a stranger does not have a high value

You found an unknown coin in your wallet, the first thing you need to do is to move out your main funds out of that wallet, tranfer your coins into a new wallet.

A lot of people randomly woke up and found Solana meme coins in their wallets, and most times this meme coins could be worth $5,000 - $10,000 and if you try to swap or interact with this unknown coin, you will be hackers access or permission to your wallet, directly or indirectly.

This Is how a lot of people get drained, one of our frens here got drained of $70,000 after trying to swap a meme coin he could not remember how it got into his wallet.

Stay Safe Out There.