OK...
If 1 and 7 are firing together, how about 9 and 15 (17&23, 25&31, etc)?
If not, swap out the 74HCT273 next to the #2 RJ45 plug. If that doesn't fix it, look for solder bridges around that IC and RJ45 plugs 1 and 2.
If 9 and 15 are firing together as well, then you need to look at all of the '273 ICs and the PIC for a solder bridge.
Also, be sure that the Freestyle board is on a non-conductive surface or mounted in the box when you are doing your testing.
The 74HCT273 ICs basically buffer 8 channels of triggers (for the SSRs) each. The 74HCT4514 selects which of the 16 '273 ICs is active at any one time.
Good luck!
RM