what is so different about ano hana episode 7 and 8 from the rest?

so im trying to run Ano Hana through handbrake to lighten the load on my harddrive but whenever i get to episode 7 and 8 it starts to act up, i didnt get to 9-11 but in any case if 1 of them doesnt work i gotta wonder why. i tried doki's version at first and it gets to about 20% of the way through 7 and 60% through 8 before just plain stopping, 9 started but i ended the process to try to figure out whats going on. i tried UTW's version and it starts to scan the file to load it into the program but it just locks up as its scanning and i have to stop it to unfreeze handbrake. im a bit perturbed by this as ive never seen anything like this happen before with anything ive run through handbrake.