As already mentioned above, the AP is towards the lease cost of that car because you’ve picked something that is beyond your monthly payment.
There are a lot of cars with no AP and low AP, next time have a good look around if the money is an isue.
You might be aware but on the Motability site theres a car search function, you can filter what you need and then select all manufacturers to see multiple cars and prices.
Also as already stated most dealers dont ask for any money upfront, if you paid it all at time of order, report them to Motability