It is much more likely that your astigmatism is very mild, and your optometrist decided not to correct it, and corrected only the myopia. This is common because toric contacts are more expensive, more difficult to put in, less breathable, and fall out easier.
As a longtime user of toric contacts, I have tried a dozen brands and every single one has the exact same mark. The shape will keep them from moving out of orientation, but it isn't enough to put them back into orientation if put in wrong, at least not quickly.
Care to share exactly what contacts you are using? Do you have astigmatism in one or both eyes? If it is toric and for astigmatism it will say so on the box- many people have it in only one eye, so the boxes will be different, and only one will say toric.
If you really are using toric contacts, but not aligning the mark, I am willing to bet you will be able to find the mark, align it properly, and your vision will be remarkably better.
Edit: One reason you absolutely need the mark is because the optometrist also needs to be able to tell if they are staying in orientation like they're supposed to, by visually checking the alignment mark. It needs to point straight upwards (vertical). If not, they can prescribe you one that is made pre-rotated to compensate.