For most, this means not having any payments which were 30 days , or more, late.
It might be, that they are charging you a "late fee" for being a "little late".
You should call your Lender, explain your situation, and ask them to move your "due date" to the 25th. They should understand.
If you do have some late fees, you might ask them to erase them; they might.
Good luck and may God bless