Some parts of text set as H1 – H6 appear to be a different style – paragraphs inside headline

On this page the text that follows

“Categories”

should be H6 like the rest of the text in that column. Even though it’s selected as H6 it appears to be a different style.

Can you help me make all that text H6?

Thank you.

link:

https://test.donvitodesign.com/?portfolio-post=v