This sounds a lot like all of the pins are in the same physical spot for some reason - like you added 8 pins that are in the same spot, then not realizing, added 7 more in the proper position around the symbol, and somehow mapped only the first 8 that are actually on top of each other. Then when you wire up one, you wire up all.
Long story short, check that your pins aren't somehow physically overlapping in the symbol.