Need to Preheat nozzles to Higher, Not Lower Temp, than print temp !

[EagleSeven]

I found that our printer has a problem getting to software set nozzle operating temp,
if the nozzle Preheat is set Lower than print temp.
(takes very long time if it ever gets there)
But if Preheat is set Higher than operating temp there is No problem.

When we first got printer I set preheat 5 C below print temp but quickly saw that preheat needed to be Higher.

Is that Normal, or is there something odd about the way our printer's firmware or hardware is acting ??