ok what did I do wrong?

[lobojoe]

I'm ussing a R Com pro 20 incubator and I placed 12 chicken eggs in it and after 10 days I candeled the eggs and all but 3 where fertile. my temp and hum stayed constant the whole time 99.5f and 45 humidity (I'm thinking the humidity was to low but that was what the inubator was set at) any how its now day 22 and no eggs are hatching but the humidity did go up into the 60's. so am I correct in thinking it was the humidity? and does anyone now how to fix it on this machine I have?

 

[Paganbird]

It could be dozens of things... there are multiple factors to consider when setting eggs.
My recommendation is to just wait a few days. I'm on day 23 & my hatch is really just starting.
It may be due to the colder weather, somehow.
Good luck.

ETA: My humidity was 33-35 during 1st 18 days... then bumped it up to 55-60 for lockdown. I don't think your humidity was too low.