Start depth tied to finish depth

I’ve had this problem before, but I usually get it to allow my entry. I type in a value such as the start depth, and SheetCam won’t accept it. The problem usually corrects itself after two tries. In this case-- it persists. Here’s what I have:
Start depth:1.0" (reverts to 0.75)
Finish depth:0.75"
peck depth:0.1
peck retract:-0.05
plunge rate:5
min hole size:0.2375
max hole size:0.2625
spindle speed:10,000. No matter what I enter as a start depth, it changes to match the finish depth. I’m sure I’m doing something wrong but can’t figure it out. Any help will be appreciated.