Good I thought another day would have better results... and good that your not opening the incubator that is very important...humidity when hatching is everything and glad everything is turning out better now. hopefully by the end of the day you will have new ducks...and more piping..
Ok just let it go and don't open the incubator lid (very important) don't even look at it lol. every time the incubator lid is opened it takes time to get the humidity back up and could be fatal to the ducks.. just make sure your humidity and temperature stays where it should...if one duck...
The humidity is fine now..its during the incubation period that sounds high if its the relative humidity that your going by. No other signs of other eggs piping?
put it back and hopefully the humidity gets back up quickly.. try not to open the incubator because you loose humidity... what was the humidity during hatching before lock down? I would up the temperature to at least a100 degrees to 101 degrees.
hopefully they will hatch and patience is a big factor and keep looking for movement . I usually shine a light on them to see if they have piped or if they move.
oh and when you put them in an incubator did you skip a day to the count...rule of thumb is egg do nott get up to temperature for 24 hours so skip one day and then count.
humidity sounds good..my temp runs 99.6 in a forced air ..do you see any pips . sometimes they are hard to see..if the humidity or temp is low they may take longer to hatch....hopefully they are still alive.