Hello,
Thank you for the quick answer. Sound good. Here are some more details, which I think shows the content’s “metadata” sent from Practiscore to PDF print is modified somehow, - and still just guessing spread through devices via sync, as explained how it started with 1 now all devices has the issue…
At the step before the screenshot I’ve shared, the content is good in Practiscore, magnify it and still ok. If we are going for the share option in Practiscore, which creates html output that way is fine -> later if I open the html in a browser on the same device and print it into PDF everything’s fine. The PDF printing is 100% the same used in the browser 
There must be something which causing this, as like 4-5 months ago none of them had this problem. There’s no PDF printer applications installed on Android, so it must be a default, system shipped service you are right. If I’m doing print from another app, this time it was Chrome, the print preview and the resulting PDF is flawless (attached). So, I still suspect the difference lays how the Practiscore content sent to the [PDF] printing service.
Thanks again,
Attis