Hi, it sounds like you may have got wallpaper paste on the surface of the wallpaper when you were hanging it. That would leave a shiny finish. Getting rid of it will depend on the type of wallpaper used. It will come off some but not others. When papering you need to make sure that you have pasted it properly including the edges, but not get any on the front surface of the paper. If any does get on it then use a damp sponge and wipe it off before it dries.
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