Exporting PDF with Lato font issue

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Edit: After almost one hour, I managed to find a solution. I wanted to remove my post, but I can't find any way to do so. The solution is below the post.

I'm trying to export a PDF that contains various special signs, including German and Polish signs. I'm using Lato font, which contains all the special characters.
No matter what I do, I always see an outcome like on the picture below. I have tried with the presets (for web / for print / for export) and I have tried with custom options (subset font on / off etc.) and the result is always the same. Nothing work. The only option to have a PDF out of this file is to print this as PDF - then it's fine. Nevertheless, I wouldn't like to use this method and I would like to learn what I did wrong and how to deal with the problem. It seems to be connected with the font itself. When I change the font to Arial, it exports correctly. Do you have any ideas, what could cause the exported PDFs to look like this? I would like to add that exported PNGs are correct.




So, the solution was to properly reinstall the Lato Fonts and the problem was not connected with the Affinity Software at all.
I just don't understand one thing. I had reinstalled the fonts before. I had downloaded them again and clicked on "Install". When a window had appeared, asking if I wanted to replace the existed fonts with the same name, I had clicked "yes". And it made no effect on the font. Only when I removed the fonts from the computer and installed them again, it started to work. It's really weird :<.