Double-arced crossbow for no reason at all

A trading card game piece apparently. And with a crossbow, since I've started to collect crossbow pistures too. This work never ends!

But why does this crossbow has two arcs on it? It doesn't make any sense. Some modern compound crossbows (and indeed compound bows in general) have double arcs, but that is because they have the cams (working like pulleys) between the limbs of the bow. Without the cams there is no point of splitting the arc in two, it's counterintuitive and stupid. It was also never done before compound bows.

This crossbow is not a double-shooter, it has only one string, so both the arcs are attached to the same string. The string is also way too thin for a crossbow. Crossbow strings need to be thick like a bolt (a crossbow arrow).

Here are the parts of a modern compound crossbow for a reference:

Crossbow assassin

Let's review a crossbow for a change! Getting tired of handbows being drawn awfully, so this is gonna be a refreshing break. Mistakes:

1. This is a pistol crossbow, meaning that it's very small, easily used in one hand. These existed, but they were toys for the rich people in Early Modern period Europe. It was not an assassin's weapon by any chance.

2. The purpose of the stirrup in a normal sized crossbow is that the crossbowman puts his foot into it and that helds the crossbow in place while it is being loaded. This stirrup is too small for anyone's foot to fit in, and completely unnecessary since pistol crossbows were loaded without the stirrup.

3. The bowstring is not drawn, but there is still a bolt (crossbow arrows are called bolts) on the crossbow. This is wrong.

4. No quiver for spare arrows. Crossbow quivers were always carried on the hip by the way, surprise surprise.