If you are noticing problems, issues or bugs after you perform a theme update, it might just be because your cache needs clearing. What this means is that you might be seeing a modified HTML structure but still see the existing Javascript or CSS code.
This issue resolves itself and it’s not an issue that your site’s visitors will see. To fix it right away you just need to hit CTRL+F5 while being on your website, or clear your browser’s cache from its options. If you’re using a WordPress caching plugin, you might also want to clear that also.