Needless to say, I won't do that again. I was just too eager to squeeze a few more eggs into the hatch. And of course, 4 of the 5 I added a day late had issues- 2 were the dead ones, and this one I think was poorly positioned, its foot was covering its beak. And another didn't fully absorb its yolk prior to hatching and had a little protruding blob at the naval for the first 12 hours, but seems fine now.
I'll give the bator a good hard scrubbin' and let it run empty and dry a few days. I've already go my next set of eggs lined up