Should the design on wallcovering always come off the correct way up?
No. Whilst manufacturers will generally look to ensure that the wallcovering does come off the correct way it can not be guaranteed and should never be assumed to always be the case. It has been wrongly believed for many years that a wallcovering comes off the roll with the top of the design going to the top of the room. This has absolutely no official foundation and is not a recognised procedure under European legislation on manufacture.