Urgent, help please!

Hello, two weeks ago I was checking on my zx6r 2025, and saw that the coolant level was on the "Low" as I had to urgently use it, I used a very few of water and made it to the half, between full and low. Now my bike is about the same, again on low. I didn't see if after the service it was full or not, but there is a marking in white above the half line, so I would say yes. Is it normal? Should I be worried that my bike after so few drinks coolant like that? Am I having a failure on the coolant system?