Czech epub and mobi loading with all small words joined to big words

[Hsingh]

Could you check the ePuB file using Calibre software to see if they have the same problem described in link below.

Problems with epub imports pushing words together

I encountered this a few time in some books. It has something to do with what is being used as a space in those ePUBs. It will not be visible when reading the book but there is something else being used instead of a space. If you use calibre and edit the book it shows up as these gray boxes in calibre (refer to screenshot below). The first screenshot shows the problem and last screenshot is from Calibre when editing the book. [Screenshot 2025-06-29 181928] [Screenshot 2025-06-29 181448] …

Some ePuB use something different for space (but still invisible) between words which LingQ doesn’t parse correctly.