Graphic bugs on Homepage

Hi!

I installed Tyros about a month ago and was very happy with the result.

So last week I changed the font to MS Sans Serif, and everything looked fine. But this morning the font was messed up and I had to change it to another. Even if this fixed the problem with the font, there is still some strange and annoying graphic errors on the first load of the Home page. You can see for yourself. I can not get rid of these.

Here is my website: https://www.mimerbokforlag.se

– I have checked with my webhost and no files have changed
– The problem only seems to appear i Firefox (but since is the most popular browser that doesn’t really help)

Any idea how to fix this?

/Mikael