Small Changes nnede for a WoodPress Plugin - PHP-JS-Ajax

Small Changes needed for a WordPress Plugin - PHP-JS-Ajax
Please see attached images and visit
https://ww2.stencilmagic.net/design-your-own/

This site is for development only, finished changes will be added to the Live Site...
I believe it to be small changes in the PHP-JS-Ajax
Thank you very much

SEE - https://ww2.stencilmagic.net/design-your-own/
to test problems listed below:

Not allowing to save
Not allowing to add cart
Not showing preview correctly
Grid out of alignment.

PLEASE THIS IS A SERIOUS PROJECT...
PLEASE READ THE DESCRIPTION IN FULL...
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