Weird artefacts in two of my Windows, what is it?

I should’ve said on the previous post - FYI it was the coating had been done wrong. Basically been done on the wrong side for those 2 panes.
 
Yep! thanks to you! :)

installer said can be swapped over within a couple hrs, ours out - new ones cut to same shape - new ones in (y)
 
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