Looks like they forgot to make it +50 and kept it at +0, seems like a silly mistake.
Please see the thread and comment from Mod Nexus here: http://services.runescape.com/m=forum/c=7z4J7ufvEuw/forums.ws?309,310,656,65638261 - anyone that's had a problem today will get their boosters, apologies again for the inconvenience and thanks for your patience.