Wallpaper been on the wall for 5 years is now bleeding through some pink/melon areas. Happening to the entire wall. Textured wallpaper. Any idea why?
Possible moisture is interacting with the wallpaper glue underneath. Is this an exterior wall? Is the joining another room, maybe a bathroom or unheated space?
Have you tried to wash the stained areas with a clean white cloth and some water? If some of the stain is lifted with a simple washing then it isn't moisture coming through. Could be something like air fresheners or other chemicals reacting with the wallpaper directly.
Just a couple ideas, hope it helps.