are you by chance using a "high limit" and "low limit" in the xdf entry of that LDRXN?
i did this earlier, with my high limit set to 160 for everything to look nice.. all changes i did in tunerpro above 160 was IGNORED.. very annoying untill i figured out why, and as you pointed out, hex editing them worked just fine
also, go into the XDF header settings and alter the field called "Bin size" to: 1000000
im 100% sure this will solve your problem.