Doesn't stay together

Our beds may be too cushiony - but it doesn't hold our beds together very well, and it makes it have a whole in the middle - we have a very old house and the doorways don't allow beds larger than a full through them so we had to improvise and we got two twins to make a king size bed in our bedroom, with this we might as well have the beds separated because they feel that way anyway. I have to purchase another form to put in the middle to make it have less of a separation.

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