Small Changes needed 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 minor changes in the PHP-JS-Ajax
Thank you very much

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

1. Not allowing to save
2. Not allowing to add cart
3. Not showing preview correctly
4. Grid out of alignment.

Please visit
https://www.stencilsonline.com/design-your-own/
to see it work correctly (same plugin)

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