I doubt it’s a mistake - if you moved in during the middle of the month, it makes sense that you’d be charged prorated rent for February ($250). The question is whether the rent portion of that $1300 is for March or for your last month’s rent. You’re going to have to just ask your landlord. We can only guess, and we don’t have enough information. There’s nothing wrong with asking your landlord for clarity on what the payments are going toward.