Hello,
1. Add to cart does not work due to custom code: https://monosnap.com/file/jadaVIZwWXIt3aRhUhMhxeVQtUPcOj we suggested to remove it, you have not removed. Please remove.
2. Stock status is the Woocommece functionality and WoodMart does not influence that.
3. This add to cart has been influenced by othe plugin: https://monosnap.com/file/8hK8yOgzIkFohqqC3fXYuuwvQ4txG9 it has its width. In order to correct the issue, the wrapper width should coincide the default width: https://monosnap.com/file/WCAKkXmBIpybuWCZPADVrzQHu8g7rKвраппер
Please correct all items as per our suggestion.
Best Regards