While creating some custom PLC cards they suddenly started randomly adding and trimming lines inside the module. Very strange. Some drawing they would work fine on and others would do this.
I could find nothing on the forums about this but I finally figured it out. I was inserting the PLC with a scale of 1, however the some of the drawing properties had Scale set to "Inch scaled to mm."
What made me start looking at insertion scales? The insertion X was HUGE.
It should look more like this. I hope this helps some someone else.