Paw Paw, I don't think you have a problem.
When you adjust the brightness on the LCD display, the process that handles the reading of the PCM is momentarily interrupted causing some or all of the displays to read zero ("0"). This is a normal occurrence, but the Gryphon should resume normal monitoring functions after the brightness adjustments are complete.
If not, either a key OFF/key ON sequence or unplugging and reconnecting the Gryphon at the OBDII port should fix the problem.
Anyway, unless you cannot get your display to function like it should, you should be fine.
- Jack
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