Theme update – Font and other issues

Hi! First of all amazing theme, thank you!
I experienced a problem right after I have updated the theme yesterday. The whole website crashed and it was a challenging problem to fix. Then, right when I thought it was all fixed, I encountered another major problem; every font, padding size, the mobile menu, and its icons were somehow different, off, and/or enlarged. I had to go back to my old version of the theme by using a plugin. For now, it is not a big deal but I would like to be able to update my website in the future. Can you help me with that?

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