Loan repayments allocated to wrong loan

After having taken two loans in CP1 (originally 50 years), the repayments seem to all have been deducting the debt on loan 2. This results in the debt on loan 1 being >> the debt on loan 2, and the repayment amounts proportionally skewed.

I would expect each loan had its separate balance, and any repayment for a loan would reduce the debt on that loan.

...and now the 2nd loan somehow was repaid in full, despite only 33 in-game years have passed, and the loan was supposed to be repaid over 50 years.