No idea why...poor little hoggy! I have middle-aged unbred Florida rat snakes (Yellow x Gulf Hammock x ?) that every year produce double clutches of eggs, like 2
dozen or more for the first clutch & upper teens for the second clutch...some are clearly slugs while many others look like good eggs (& in fact this year I incubated
the good ones & THREE of them hatched!?). These big girls make me nervous, I wish they'd quit producing eggs... Years ago, I lost a nice Calif.desert king to
egg-binding & she'd never bred either. Years further back, I had a rat snake that had an ectopic pregnancy (the eggs were not in the oviducts) & I was fortunate to
find a vet that successfully spayed her- that solved the problem. Good luck with yours...