1st coat didn't want to stick properly

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Not a pro plaster tradesman by any means, so any help welcome...
Bought my house and ripped everything out. Tackling kitchen so far and can't complain. While ago I Stripped wallpaper thoroughly!
Lastnight I applied PVA (4x water to 1xPva...4:1) then Today applied 3xpva to 1 x part water (3:1)... To old plasterboard! When tacky I applied 1st coat of plaster which went on great but had few patches where it Just seemed to slide? (See pics).
Any ideas?
Second coat went over the top of 1st and seemed to adhere to no problems!
Any thoughts? Just made me stress a bit about 1st coat and thought whether or not second coat would adhere to...did thankfully!
 

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