looking at your photo the BOB looks like this one
if the UC100 micro controller a low power device
the twelve 10K resistors connecting the BOB's +5V supply to the 74HC245 IC inputs could power the UC100
by back feeding power into the UC100 output pins via the 74HC245 and UC100 IC protection diodes
in this state you could be getting spurious signals going to the safety change pump
example of protection diodes inside IC
John