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Paint to cover stains

Hi. The wife and I recently moved into our first home.
I stripped the wallpaper in the bedroom and living room and hung 1400 grade lining paper. I left a 1mm gap between some and filled it with decorating caulk, then sanded it off. (Should've butt joined it all).
I then painted with dulux Matt emulsion, 2 coats.

Where I filled with caulk and sanded, there is a shimmer kind of stain that runs down the joint and it won't go away. I maybe should've put a primer coat on first but I was told 2 coats of emulsion would be sufficient.
I'm not sure why its stained as I thought it was meant to be paintable.
How can I fix this issue? Would a stain cover paint like zinsser cover it? Would I have to cover the whole wall so it's not uneven?
I really don't want to tear it down and start again, or cover it with another wallpaper as we have a feature wall already wallpapered.
Hope someone can help!
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