Repair Inside Patch after outside crack repair

[Jeremy2014]

Hello Expert DIY

A damp issue was repaired which was caused by an external crack which one small area of the internal walls to bubble and paint flaking off.

I have scrapped the loose paint and apply filler and repainted.

but now a week later, as you can see the paint is powdering, flaking off again.

Am I missing something?

Thanks in advance to anyone for your expertise.

 

[Wayners]

That's looks wet. Needs further investigation to determine where water is getting on. Could be roof and running down cavity?

 

[Jeremy2014]

it use to be damp but now it is dry when hand on the wall. what we see as damp is more the colour difference on the paint. (as not done a good job one could say)
I am more concern on the paint peeling powdering - little bubble and when touching the surface, it is like powder.

does that means the wall is not dry enough and I have painted too quick??

 

[Jeremy2014]

Now, 3 weeks after, this is how the wall look like... kind of how it was before... no clue what to do ...
Weather has been quite good - so what is causing this?