why does my utau keep making "sh sounds instead of "shi"

[pastelstarlight]

i have finished voicing my utauloid but everytime i want it to sing shi is only does "SHHHHH" its the same for anything for she to sho
and si to so.
Footage :The problem

 

[SunnyWolves]

It might be because the sh sound in the original recording is too long. You should try to keep all consonants short if you can.

 

[pastelstarlight]

It might be because the sh sound in the original recording is too long. You should try to keep all consonants short if you can.

i voiced the samples beginings shorter and it made it worse...