I'm designing a steering mechanism following the Ackerman principle. I've met the condition that my steering arms' normal projections must cross in the middle of the rear axle however when I do a turn my wheels' axles do not cross in a single point on the rear axle. I'm applying some visuals
where the bottom most line is the x axis of my drawing, so the wheel base is 1210mm. I've set the length of my steering arms at 150mm for demonstration purposes, where 756.82mm seems to be the distance between their joint points. The white lines that go off to the right are the projections of my wheels' axles.
Here's a visual of when turning at 15 degrees.
The lines should cross, I can't figure out what I'm doing wrong.