Font (weight) problem?

Dear,

First of all, thank you so much for this beautiful theme. It is very fitting for our project!

I hope I can explain myself well. I’m working on the website of Jeanne de Bie (see link), and experience some trouble with some font(s). Somehow the font in the menu was impossible to set to 200 or 300 of font-weight, 100 or 400 do work (I tried with different fonts). Except for the page ‘proces’ where the font-weight of the whole menu would change after clicking on this menu item, due to that I was able to change it in the font settings specifically of the plugin that come with the popup (see bottom-right of the screen after clicking ‘proces’). Eventually I decided to put everything to 400, because all of the buttons are now the same.

Though, when opening this website in Safari, all the buttons show a different font then the font I assigned to it, except for after clicking the ‘proces’ page button in the menu. Then the whole menu changes to the font that I set up for it.

In Firefox and Chrome the whole menu is shown in font-weight 400, and the ‘copyright’ below it shown in 100. Though, when clicking on the ‘proces’ menu item, the ‘copyright’ turn into 400. (This is maybe due to the plugin behind ‘proces’ popup).

Perhaps I have two main questions. First: does anyone know how come I am not able to change the font to 200 or 300? Second: why does Safari show a different font on the menu items, except after clicking the ‘proces’ menu item, or how can I change this menu item?

Maybe there’s a clash between the plugin for the popup and the theme. At the moment I’m not sure where it’s going wrong, or to find what where.

Thanks a lot for helping!!

All the best,

Diana

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