Can not change font (bug) LO 5.0.3.2

Opened calc this morning and was surprised to see that fonts on was showing wrong (an using arial in all the sheets, but today I saw calibri and liberation sans, which is not even on my system (win10)). Whats more sizes were distorted as well.

Trying to change fonts back to what was supposed to be (just Arial), would not work on some cells (mostly where is data validation, but on some regular cells as well). Im using portable version, so i decided to update to latest 5.3.0 with default settings, no luck. I attach picture to show that. I assume it has something to do with file itself, but how and why?
image

I wonder if somebody encountered similar problem and come up with solution.

Just curious which font would be in next cell, given that the first three have fonts starting with next alphabet character :slight_smile:

My favorite - Diavlo Black. :smiley: Unfortunately there is now relation which font i choose.
I am using LO for long time and it is actually never happened before. I checked other files and trey are ok. Is there any settings related to to file itself?