I'm not sure what's going on in your scene, but you have rangemappers driving enables. Enable is a bool ie 0 or 1, and is best driven by a node that outputs a bool (rangemappers output a real ie decimal). I'd suggest driving the constraint enable with (say) a compare.
If A > B enable, if not disable etc.
If you hover the mouse over a node input or output it shows the data type ie string, real, vector etc. Although in XPresso you can mix n match data types to some degree eg connect an integer to a string (say for a text readout), things like enable deal in 0 or 1, whereas rangemappers convert one varying range of values to another.