Auto max yscale do not display the all graph

Hi, I’m using Grafana v5.3.2 and InfluxDB.
I do not understand why the maximum on the yscale is not display on my graph. We can see that the y axis is cut at 1000 while the y max is higher. The thing is I plot two other panel graphs that have the same shape and same maximum and do not observe this behaviour.

Can someone explain this behaviour and help me correct that?