u/Confident_Ocelot_745

So I had a BanKo account with 50k for a few months now. I haven't been regularly checking it but I've noticed that its interest flunctuates. I don't move the money so the ADB should only be increasing every month. However, there are months where I'd receive lower interest than others. Is this something that should be reported or is there other way they compute the interest? I just know that I should earn 2k by the end of a year if its 5% interest with 20% withholding. Thank you!