EDIT: Pretty sure it is being caused by the KSC Switcher mod. I figured it out because as soon as I got off the KSC on the ground the science readings would pop in fine. It was only when at the KSC it wasn't working. After removing KSC Switcher, the KSC science readings started popping in fine. Possibly because the KSC switcher makes the science readings appear to come from that particular version of the KSC that you've switched to. I've just removed the mod anyway, I don't need it at the moment, but could be something to look into.
I'm starting a play-through with the GPP mods with KSP 1.3 and for some reason X Science is not notifying me of science on Gale ground. As soon as I take off, science is pinging me though. Anything that would cause that? Is there like a minimum notification setting or something? Most of the readouts are under 5 points, so was thinking perhaps there is a setting somewhere. Any thoughts?