The image looks like this (low-resolution palette and low-temperature span) in FLIR Tools:

The cause could be that the camera is configured to stream in temperature linear mode. The software is unaware of this mode, so it interprets the signal as an ordinary signal, which it tries to convert to temperature with the RBFO formula:

As the signal is already a temperature, the calculations result in a corrupt image.

The solution is to set the camera to signal mode instead of temperature linear mode: change the GenICam register TemperatureLinearMode to Off.

For more information about about the temperature linear mode, refer to the Ax5 ICD document.