I have the same issue. When you first meet Erika, if you ask her "Are you at my full disposal?" you don't unlock her stats. You must choose instead: "I'm eager to start".
To fix the relationships, open the console (Shift+O) and type:
then press Enter and Esc.
The console should be already enabled, otherwise google "Ren'py enable console" or use
Unren.
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Aria's exam throws a warning every time Aria speaks.
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Lacey Greene's second examination review was completely blank, not sure if a bug.