This may be money transferred from the sinking fund and not yet repaid or it could be money owed to the admin fun in levies.
What a lot of OCs do at a time of tight cash-flow is to maintain their liquidity by “re-transferring” the same loan from the sinking fund every three months until they are in a position to repay it. It’s not strictly legal but it’s not the end of the world it you keep track of it and for many OCs it’s preferable to having a special levy or raising levies to deal with a temporary shortfall because once they’ve gone up, levies never go back down.
Just keep an eye on it in the annual accounts and make sure it doesn’t get any bigger becasue that means your levies are too low and your sinking fund is being drained.