Chronus
From your declared profile, I will forgive your ignorance, on this occasion, but request that appreciate that you have 2 ears and 1 mouth, and suggest you use them in that proportion to learn from those that are professionals.
It is perfectly normal around the world to report when you are maintaining your cleared level, for ATC information as much as anything. Often it will alert them to the possibility of re-clearing another aircraft to a FL you have now cleared. Quite often it allows you to benefit, and be cleared to your requested level and save some fuel by getting a climb a minute or so before ATC might have noticed on secondary radar that you were maintaining your level. When it comes to primary only radar cover, a report of maintaining cleared FL is even more inportant.
As I said before, sometimes you forget is you called level. It is then simpler to repeat the call to be sure. Nothing should be inferred from it, none of us has 100% total recall.
Good night.