did they get ratings of 8 or 9? If not, morale will drop automatically. 7 is the point where morale starts to decrease guaranteed. I have no clue why Einsteins at Nordeus seem to think that 7 is the number instead of 5 or even 6. but 7 is the most frequent along with 6 and those both lose morale.

There is an old thread by cracicot that did a test on morale. check it out.