Random damp patches on wall

Yes it's an outside wall chimney breast. The dehumidifier does have a threshold control which is pretty good.
 
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The wall on the outside is very good with good mortar. What I now can't understand after putting the insulation wallpaper up is a very cold corner with actual water sitting just in the join. I have dehumidifiers and this isn't the chimney breast (possible salts etc) so why would it be attracting cold and damp ? Other walls coated with this paper are much much better.
 

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