Hello,
Due to the Header Overlap style, it might be happening on the single product page.
Navigate to WoodMart > Header Builder> Edit default header (highlighted star icon), or you can go through the admin bar directly.
Click on the Settings button and disable the Make it overlap option.
If you want to disable the overlap only on the single product page. Please try creating a new header and disabling the header overlap, and setting it as the Custom header for the single product from Theme Settings > Single product > Custom single product header
.
You can read our detailed documentation for further help: https://xtemos.com/docs/woodmart/options-for-pages/
Best Regards
.
