Q.Brussels sprouts
I ordered Brussels sprout seeds and I don’t think these are. Could someone tell me what these are?

I would agree that is is not Brussel Sprouts.
I appears to me to be some sort of leafy green. The yellow little flowers seem to be the plants bolting and going to seed. A reputable garden center should replace the seeds.
Here are a couple of links that may help.
https://www.gardeningknowhow.com/edible/vegetables/greens/leafy-garden-greens.htm
https://www.gardeningknowhow.com/edible/vegetables/brussels-sprouts/how-to-grow-brussel-sprouts.htm