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Hi, I'm Mike G and I'll be assisting you. Tell exactly what the issue is. Also the make and model number of the dimmer and the type of lamps.
I need the model number.
Stand by while I check on the devices.
Very unusual issue. Did you make any adjustments to the low end wheel on the left face of the dimmer? If not see if a settin change corrects the issue.
If you only have 2 blacks, it's a single pole and one red wire from the dimmer isn't used. The hot wire connects to the black dimmer wire and the black wire to the light connects to one red dimmer wire. The wheel is on the left front. It is disabled with the cover off.