I think in your case, it is fine. I never overstayed, but a couple of times, I stayed 2 months plus I extended 1 month. I didn't know it could have been an issue. Now I know
have no idea cause the IO didn't write anything apparently. However, I saw many foreigners had similar issues at that time at the airport. They have been questioned a lot in a separate place. About my case, first she just asked me to wait and left, then she came back and asked me a couple of questions and let me enter