I CAN'T CREATE A NEW TASK ON THE DATE I WANT.

I CAN'T CREATE A NEW TASK ON THE DATE I WANT.

Good morning,
I have been using connect for a year now to schedule various tasks and today for the first time I am facing a problem:
when I enter a task on a specific day it automatically moves it to the next day, or the day before. I have also tried moving it back again by dragging it to the day desired but if I update the page or if I simply go ahead in the calendar and then back to the week it resets the task to a different date. Can you guys help me with this?