Espresso with capsules Nespresso compatible Nespresso Inissia D40 L - Black

Hello, I have a problem with the machine. The cup size buttons seem to be reversed. The small cup button makes the longest coffee. It also varies every day, sometimes the coffee doesn't flow for very long. Electronic problem?

In perfect condition, like new but if we can just please avoid over-packaging (oversized box with lots of plastic inside to wedge the small initial box ...) thank you