as far as i'm aware, when you take out a loan, the interest payments are added to the total amount owed and then split up into the monthly payments.
Therefore if you borrowed (say) £1000 over 10 months plus interest was £100 the monthly payments would be £110 (so both payng some interest and some capital each month)
If the payments are the same, it would make sense that you are still paying the interest. In the absence of your judgement making it clear, i wouldn't be surprised if they added more interest on for the time you weren't paying too