In Model View:
If the prediction results have any black or white areas, those areas are below or above the rendered SPL range.
If rendering SPL, in the right upper-corner of the main window, the maximum, minimum, and the delta SPL values are shown. Please adjust the Max Value and Range to match the displayed values, FILE > PROJECT SETTINGS (cmd-shift-P), SPL tab.
If rendering Attenuation, in the right upper-corner of the main window, the maximum, minimum, and the delta SPL values are shown. Please adjust the Range to match the displayed values, FILE > PROJECT SETTINGS (cmd-shift-P), SPL tab.