As others have mentioned, the email isn't coming from an external developer account, but from Itch.
The system is supposed to work like this:
If I'm a developer, I can send a message to everyone who owns my game. The message is sent through Itch, which is why you'll receive an email from Itch at the email address associated with your Itch account at that time.
I recommend reading this post:
https://itch.io/t/1856548/how-do-i-turn-off-email-notifications-for-games-i-have...
https://itch.io/t/859194/questions-regarding-emails-to-people-who-purchased-a-ga...
In your settings, you have an option to download all the information Itch has about your account. If you download it, you should be able to see a list of all the games associated with your account, and I'm sure those games/developers will appear there. It's most likely due to the purchase of a bundle, but if you think it was a mistake, you should try contacting support.
