It looks like the seat mechanism is not locked correctly, when it is out of the car it should be locked in the folded position if it isn't then the pins will not be in the right position to lock into the holes in the body, if this is the case take the seat out, hold it together and give it a good push, it may take some good pressure with a knee and body to achieve this, once locked put it back in the car, hook in the front, lower the pins into the holes and give it a sharp push, while doing this you may have to also push the seat backrest down at the headrest and you will hear the pins click into place. Sounds complicated I know ( well it is an Audi) hope this helps.
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