Anchor benefit repay?

I got a notice in the mail saying I have to pay back the Anchor benefit I received for 2020. I’m sure it’s not a scam, but I’m kind of surprised? Why wasn’t I just not granted the benefit in the first place. Seems weird to give it to me and now take it back

I got a notice in the mail saying I have to pay back the Anchor benefit I received for 2020. I’m sure it’s not a scam, but I’m kind of surprised? Why wasn’t I just not granted the benefit in the first place. Seems weird to give it to me and now take it back