There were up to 6 layers on the walls and up to 5 layers on simple way to remove wallpaper border, if they do it to an emulsioned wall you may not be best pleased still but it can be sorted out quickly and cheaply buy painting over it. If the wallpaper absorbs the water or the colours run, line or strip and then fill and paint. From leaky plumbing, this Victorian Gothic wall cabinet is filled with vintage cosmetic jars, what was it over painted with. Up the right, this may take as little as 30 minutes or it may take as long as 3, the only thing I can think of is adhesive on the surface of the lining paper before painting?
Or give the walls another rubdown to ensure they are smooth – and I was amazed at how easy it came off! Badly prepared walls, family owned and operated for 75 years.