Problem with H1 tag

Hello good morning, I have an error apparently on my website and I don’t know exactly where the problem is because I don’t understand much about it.

I did a test on my site using the Rank Math plugin and it says the following:

“Too many H1 tags found on your homepage (2). For the best SEO results there should be exactly one H1 tag on each page.”

I don’t know how to solve this and I don’t know what is causing it either, so I posted this request for help on the PostX and Colormag theme forums.

This is happening on all my websites, all use colormag + postx plugin:

https://vocesabianime.com/
https://crazyforanimetrivia.com/
(18+ CONTENT WARNING) https://cakemoe.com.br/

Thanks to anyone who can help me with this.

The page I need help with: [log in to see the link]