BNM has maintained OPR. Bank of England too! Same reason?

As soon as the rates are changed higher or lower, banks will have to inform their customers of the change and then inform of the new amount to be paid. This is usually very quickly. When the central bank lowers the interest, they hope businesses will borrow and expand. This decision to borrow and expand will take time. Meanwhile for the people who has Fixed Deposit, the rate cannot be changed and it can only change in the next renewal whether higher or lower.