why pump cavitates despite enough NPSH 2

[kalamarhss]

Hi to all fellow engineers.
We have a pump that cavitates despite there is enough NPSH.
The working fluid is water at 45 Celcius. Pressure just before the pump is 0.2 bar that means NPSH=12m, well above the NPSHr.
What are the possible reasons for this except wrong curve from the manufacturer?

 

[ports394]

Is the impeller damaged from cavitation? Check that to verify it is happening.