Why SEO Checker tools can still see hidden Header tags?

EuchG Member Posts: 7
edited June 30 in Discussions

Hello guys, please try it yourself..

So if you hid H2 or any content on your homepage, then publish, then run your website using this https://www.seoptimer.com/ or any SEO checker tools.

The tool can still see your hidden content and marking them as duplicated.

Any ideas? or is this an existing issue?