Hello,

Please, try to check that the modified HTML block is enabled for this product tab, go to Theme Settings -> Single product -> Tabs -> in the “Content Type” field, make sure you’ve enabled the modified HTML block

https://monosnap.com/file/SHvrVh5dfMRYW7eYeHS7SyayCZXLXd

https://monosnap.com/file/RRk1tkzborqYHF4GBUull2o57PvCtO

If it didn’t help you, please provide your site admin access to the private area, I will do my best to help you.

Kind Regards