Silk emulsion peeling off matt underneath

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Not experienced this before and it's really got me confused - not an expert but I've done a fair amount of decorating in my time.

Just started decorating a room which was matt emulsion all round. Did the usual sugar soap wash, followed by two clean rinses.
I then rollered a B&Q colours white matt emulsion, then filled any imperfections.

Then began painting.. 3 walls and ceiling with dulux silk, 1 with a valspar silk. Two coats of the Valspar, three of the dulux, all finished and looking fantastic. Then i noticed a dreaded drip on a 4 day dry wall so i went to sand it off but as i did so the paint started lifting and peeling away - some of it in big strips. Infuriated at it getting worse and worse and knowing i couldn't feather it i ended up peeling the whole wall off!! Now i'm having similar issues on two of the other walls, can't feather it but doesn't peel as easy with a scraper / chisel.
The back of the peeled paint is white so it's taken the white matt coat off with it, the walls feel a bit dusty now (but didn't before I applied the silk!!).

What on earth could have gone so wrong?
 
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Seems very strange you prepared ok and even if it was a very old paint job using distemper it would have shown up with the sugar soap wash.
Not a fan of own brand emulsion perhaps the white was iffy, have you tried doing a patch with the dulux to see if it adheres better?
 
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Silk is awful stuff. The mistake you made is not thinning your first silk coat. The matt has sucked out the moisture before the silk had a chance to grip.
 
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Thanks for the replies.. I'll give both a normal and thin coat a go in patches and see what happens! Joe-90 just water to thin it? Any suggestions of ratio?
 
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I'd go 20% water. The give away is the powdery surface. That won't happen if you thin it.
 
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Meant to reply to this a while ago. I watered down a matt coat first, then a watered down silk, then silk on top (only done a small patch of the neat silk so far but seems to have done the trick!)
 
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