When the machine does what you tell it and you’ve told it incorrectly
Did a roughing cut for project yesterday and thought I’d get an early start on the finish cut this morning.....Wrong.
Started my cut and the spindle moved to the far upper right corner of my workpiece. (Should have been a clue)
Hit the e-stop and rebooted everything. Same issue.
You know what they say about doing the same thing expecting different results!
Finally looked at the file and sure enough it went where it was told to.
My toolpath wasn’t set to selected vector. Was set to workpiece boundary

Another newbie lesson learned....