Need reader feedback on ePUB quality

Hi, if any readers out there can do this, please post a comment on the font quality of any ePUB versions of my novel you may have purchased. I discovered that my Lulu created ePUBs are glitchy on the Blackberry Playbook. The font size is acting fixed rather than able to become bigger or smaller. That's not what I was led to believe about how Lulu's converter did its work. I'm hoping the glitchiness is solely the fault of this app, but would like to know if it's a fault in other readers. I saw no sign of this glitch when using Kindle. Thanks in advance.

Update:

wl552 came to my rescue and tested an ePUB version. This is definitely an across platform problem with the fonts. I wouldn't have known except I finally have my own tablet and saw this today. Everything looked fine on Calibre. But it's definitely not on her tablet or mine. Instead of getting font resizing, we see line spaces between text get larger. Not good.

I'm working to find out why the ePUBs are doing this. Will post later.