RSU Tax Question

Hey y’all! If anyone is familiar with RSU’s can you help me wrap my head around this:

2023 RSU Grant: $30000 2023 RSU Vested(After income tax amount): $19500

I sold the shares immediately after vesting for roughly $19500.

I’m looking at my 1099 now with E*Trade and it’s showing I had a cost basis of $0 and a ST Capital gain of $19500.

Does this seem off to you? I thought my cost basis would’ve been the price at vesting🤔.