Bolded text doesn’t always show up

Hello everyone,
I have a problem with my site. Sometimes bolded text doesn’t show up (in heading), while it doesn’t show up at all in the paragraphs, even if I used it. I’m using “Texas” Theme (free version). I wasn’t able to get support from them, so i’m asking here.
I played around with chrome inspection tool, and here’s a screenshot of what I found. https://imgur.com/McWRa5d
Basically, the highlighted text should be bolded, but it’s not, maybe because of a conflict in the css code? I’m no CSS expert, so I don’t know how to solve it. Any advice is appreciated.
Thank you in advance

• This topic was modified 6 years, 2 months ago by zanza.

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