Printer icon in Dock...

I just recently purchased an iMac (late 2015 modelIMAC (RETINA 5K, 27-INCH, LATE 2015), Sierra OS X 10.12.4, Memory: 24 GB. To be sure, a wonderful machine. When I installed my 2 laser printers (HP Color Pro 252dw, HP Mono P1606dn) and printed test pages for both (successful), both icons displayed themselves in the Dock and, before each printer did its job, a red circle with a number in the center (this time the number was a "1") was displayed. ..nothing new. However, as has been normal in the past where the red circle would disappear when the job had been completed, in this instance, it remained - on the color icon only. I tried deleting both icons within System Preferences >> Printers & Scanners...then re-installing them both. No joy for the color laser. ...minor in the entire scheme of things, but I hadn't done anything differently (installation-wise) and now this. Suggestions?