Problem with UTAU not singing high notes sometimes?

Hii! I've tried using kiki sagawa's 6-pitch vcv voicebank to sing teto's part in mesmerizer but when it gets to some high notes, she doesn't seem to sing them? The thing is that she can sing that note sometimes but with a different letter? So I tried seeing if she just can't say 'se' (the first problem note) but she can, she just can't sing anything in C5 (which is the falsetto part of her voicebank I'm guessing) but the high note before that is 'ku' which is the same note? I tried using Namine Ritsu's Kire voicebank to and she run's into the same issue but with even higher notes. Yokune Ruko's voicebank works fine with the high notes so it looks like an installation problem, I just don;t know where to start. I've check the format of the notes, tried to fit the voicebank to the UST and reinstalled their voicebanks, maybe I'm not installing them right? Any help appreciated.

https://preview.redd.it/o2gwpr3nkcfd1.png?width=1415&format=png&auto=webp&s=a89dfdf7c382e9a5cbc4cac749809cf58fb81bff

She can sing \"Ku\" but she doesn't sing \"Se\" even if I change the hirigana, if I lower the note, she will sing it but nothing above C5 in most cases