If you had a significant number of eggs die off at one time, I would suspect something like bacterial contamination of the incubator or incorrect temps but since it was a week since your last candling it's hard to say how closely they were in age that they died. I find that is an age were I will often lose some. Some are typically lost in first few days. I will see the beginnings of veining then few days later, I see a blood ring. Then there are those that make it a bit longer like in that age range you describe and die. If these are shipped eggs, to lose 7 or so out of your 18 and have the rest hatch, would be a good hatch for shipped. To lose 7 eggs seems like a lot but that's not a big loss from the total on shipped. However if these weren't shipped and the eggs were from healthy well fed hens, I would wonder more about why these died. Again, I would consider some kind of contamination or temp issues. Maybe too high heat. I found out early that if you have those lower priced Styrofoam incubators, you have to be less trustful of what any built in thermometers tell you. I have found them to be significantly off. Even the mercury ones included can be a couple of degrees off. Enough to kill eggs. I calibrate all my thermometers now and rely on a digital lab quality one for my incubators. I trust it before anything else. This is the one I use. Works good and not real expensive
http://www.amazon.com/gp/product/B002NX0VQU/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1
This thermometer comes in a Celsius version as well as Fahrenheit . The link is to the F version. Be sure you know which you are getting. The batteries lasted months even with me forgetting to turn it off and all of mine were 2/10 of a degree or less off.
http://www.amazon.com/gp/product/B002NX0VQU/ref=oh_details_o02_s00_i00?ie=UTF8&psc=1
This thermometer comes in a Celsius version as well as Fahrenheit . The link is to the F version. Be sure you know which you are getting. The batteries lasted months even with me forgetting to turn it off and all of mine were 2/10 of a degree or less off.
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