Y-calibration goes wrong the first time (easy work around available)

# Expected Behavior
After calibrating the y-axis, the farmbot goes all the way back.

# Actual Behavior
At the end of the first y-calibtration, the farmbot goes back half way. Recalibrating again gives the expected behaviour.

# Steps to Reproduce
Unplug the formbot untill it requires new network information
Configure farmbot WiFi and account
Go to the web interface >> device
Calibrate X
Calibrate Y

(note that calibrating Y again will give expected behaviour)
(note that I have seen this twice by accident, I did no additional testing)

# Results of `git log -1`
??