Leave Period type change when open by the validator

Hello,

we've experienced something this morning (v9.2.2), that is really complicated to manage and I cannot explain how it happened.
The employee created his leave period as "Absence Prévisionnelle". This morning  he changed it to "Congés sans solde" and submitted it.

As the validator received the notification, he connected to the system to accept it, but the leave period was returned to the type "Absence prévisionnelle".
When I look into the history of that element I see this:
 

Do you know why this happens?

Regards,
MCanuto

Hello,

we realize the problem appears whenever the leave Period is opened under the Calendar screen.

As you may see here,
 
it was created and submitted as "RTT" and when the Leave Manager opens the Leave period on the Calendar screen, the type changes to the first type on the list, and it's impossible to change it again, if the Manager accepts the request:

I hope this can help you to figure out here the issue is.

Best regards,
MCanuto