Month() and Day() Functions Replacing values!

Hey everybody.

I've created a function to count days between two different measures.

I have a measure - Today_Updater - showing the last date in my datedim table.

All of the dates are in "DD/MM/YYYY" format.

I've noticed that in the current month, Day() and Month() function for some unknown reason between the 8th of July and the 12th of July Day() gives the month and Month() gives back the day...

I am super frustrated... my region is set, all date formats are good... but still...   attached below are the screenshots:

On the 7th all is good

Between the 8th to the 12th for some reason, the Day() gets the month's number and Month() the day's number

On the 13th, it is back to normal. I really cannot understand why.

It happens every single year, between the 8th and the 12th.

Please help me solve this problem, I have zero clues about how to solve this.

Thanks a lot!