I have a Noma 5+1+1 thermostat (52-2558-8)
Which when set at 72F and the temperature reaches 72F it shuts off,

However, the furnace drops to 67F before it comes back on.

Is this a thermostat issue?. or is my furnace not working properly ?

Look at the thermostat manual for the setup directions. It needs to be set on ewhatever type of system you have. Gas.oil.electric. etc.

I believe your stat is made by

UPM Marketing Inc. - UPM (http://www.upm-marketing.com/)