Attribute radio buttons not checked on product listing pages.

Everything has been working fine for years, but recently (past week?) on the product listing pages, the attribute option radio buttons are not checked, except for the last product on the page. The HTML code shows the buttons as checked="checked". It appears that all of the radio buttons are given the same name (id[2]), so when the last radio button is checked, it clears the previously checked radio buttons. Also, when the Add to Cart button is clicked, it goes to the product details page instead of the shopping cart.

Example page: http://lyndonlyon.com/store/index.php?main_page=index&cPath=1_5

I'm using version 1.3.9h. (I know, it's outdated.)

What php version? (Admin->version in the upper right corner)

Possibly due to the 91 HTML errors on that page (http://validator.w3.org/check?verbose=1&uri=http%3A%2F%2Flyndonlyon.com%2Fstore%2Findex.php%3Fmain_page%3Dindex%26cPath%3D1_5), including nested forms -- which is most likely the root of your problem.

PHP Version: 5.4.35 (Zend: 2.4.0)

swdstudios:

PHP Version: 5.4.35 (Zend: 2.4.0)

May I suggest, do not edit any product further. See if your host can support temporarily downgrading the PHP, and prepare yourself for an upgrade. ZC 1.5.4 has just been released and it would be a good time to upgrade. Recommended reading: http://www.zen-cart.com/entry.php?3-How-do-I-rebuild-my-site-on-the-new-version-instead-of-upgrading

Reason to not edit product, it has been shown that with PhP 5.4 and ZC 1.3.9 that upon "finishing" the edit, the description will disappear from the database. Btw, make a backup, please don't take any shortcuts to the above instructions, and all will be fine.