I planted it from a Bonsai kit. The seed packet is labeled as Black Pine seeds but, in comparison to photos online, these sprouts seem suspicious. Another sprout came up, it looks more like a pine seed! The initial sprout got tall.
Yes, your sprouts with the paddle shaped leaves (in the topmost photo) certainly aren't pine sprouts, ... but in the photo second down from the top, where we see the sprout over to the right which looks like a lanky arm with little green fingers sticking into the brown shell of a seed...That looks to me like it very well might be a pine sprout, as you say. Keep your eye on it.
These look like Centaurea cyanus seedlings. I have grown them a few times and your seedlings remind me of them. Of course, many seedlings look similar when in this stage, so I'm not 100% sure. Below there's a picture of my seedlings: