Ok, simple question. (And admittedly an uninteresting one.) What's up with the pattern of missing letters in the excerpt from "Allegiance"?

I just read the "Timothy Zahn: Pledge of Allegiance" interview. Through out the body of said interview I noticed that at no point prior to its posting did anyone check for spelling mishaps. A personal pet peeve that I can get past since I'm a web developer and know that sometimes workload doesn't permit 100% accuracy on such things. (And I'll get over the fact that the publishing house producing the book appears to have not had the time to do any quality control before sending it to be published on the web.)

My real question has to do with the missing "FI" and "FL" sequences throughout the excerpt. If these letter sequences had only been missed once each, even twice, I could have dismissed it. That's not the cause here at all. Every where that these two letter sequences should appear, whether it be:

flowers (owers)
flowing (owing)
office (ofce)
finances (nances)
fight (ght)
fired (red)
floated (oated)
figure (gure)

the "FI"s and "FL"s are absent every time. So, as I asked at the begining. What's up with this pattern of missing letters?