Ducks eggs pipping, possible malposition?

[PeekinPekin]

Hello,
I'm am hoping to get some advice! I have 4 assorted duck eggs at day 28 today. I candled them at lockdown time and air cells all looked great - right size and spot according to what I've read. Yesterday afternoon one pipped but no further action since. It's been at least 18 hours. Just now I noticed a second egg has pipped but it's at the pointy end! It looks quiet now. Both eggs seem to still have intact membranes. The pip just looks to involve the actual shell. So far I've been behaving myself and have been hands off. But when should I worry? This is my first incubation experience. Thanks in advance!!! This is very nerve racking! I've also got 4 kids waiting patiently to see their babies!

 

[PeekinPekin]

Any thoughts would be greatly appreciated!! Now I have a third egg pipped but also at the wrong end!! No action from the other eggs but so far I can still see a little movement though pips and hear tapping if I put my ear to the incubator.... Please help!