Yep, the library pdfs I've tried are so-so. I think it was paragraph spacing that was inconsistent, nothing as bad as character spacing / kerning.
I have not 'purchased' any DRM pdfs but the most recent Barbara Cartland freebie was DRM pdf and the first couple of pages seem fine. You could download that and compare (just checked - still free at Books on Board). I think you probably got a lemon of a file.
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