Bold text (problem)

Hello, new guy here.

I have a Header and a Paragraph which have both Plain text and Bold.
At Blocs application i can see them in the right order. When the site i live all text becomes Bold.

Any recommendation? I have to make a class? But how is that possible when i have plain and bold text in the same Header?

Should work, just by selecting the text within the header and select "make text bold( the B on top). Do you have an URL?

That was the first thing i did, but with no success.
I solved the problem, assigned a class at the paragraph as a plain text and then i select the word i wanted as Bold.
Worked fine… thank you for ur answer @teefers.