Problem Description:

If you are using the product description to add a lot of additional text that is formatted with headings, you will find they are stripped from the content. This is mainly to ensure visual consistency in the template, and to ensure extra markup does not break the tabs.

Answer:

You should always use Heading 3 (H3) or lower in your product descriptions to allow your Product title to sit higher in the SEO hierarchy.

If you must use H2, the following may help in some themes:

    1. Go to Theme Options and scroll down to the Custom Styling section
    2. Copy and paste the following code into the Custom CSS box:
    WP-SYNHIGHLIGHT PLUGIN: NOTHING TO HIGHLIGHT! PLEASE READ README.TXT IN PLUGIN FOLDER!
    .woocommerce-tabs #tab-description h2, .woocommerce-tabs #tab-additional_information h2, .woocommerce-tabs #tab-reviews h2{display: block !important;}
    1. Click Save Changes