Is my pH probe broken? Too strange data

[Vinny]

At 3 years old, it would be best to replace the probe.

As probes get older (1 yr+), they will require more frequent calibration to maintain accurate readings.

[progman]

I ordered new one pH probe and calibration liquids.
Today I have got it.
After calibration a computer shows 9.00 pH for 9pH calibration liquid and 7.35pH for 7pH calibration liquid.
And 8.75 pH for my water in the tank ( Chemical test shows 8.1-8.2 pH )

PS I spent 150 eur for probe, liquids and delivery to my country. Thank you for the useless advice to switch to new sensor.
And maybe I should spent more money for new profilux 4 ? )))))