Okay so I have hatched a few batches of eggs and never had this problem before. I also use a very small incubator and hatch out very small batches with usually a pretty good healthy chick rate. This particular chick presented on day 19 with an external pip, later that day a different egg pipped...
Also, I am familiar with the incubator you are using, in the next batch be sure to remove that black tray and switch to hatching tray on day 18...I dont think it made a difference in this batch but it will if your eggs are fertile and developing...that tray is what makes the egg turner work...