Sorry Frank! The software defaults to some "convenient" auto-corrections. I had made a relevant post here noting the issue BUT, after asking for help on the Discourse Meta forums, found a way to disable the markdown typographical auto-corrections!
We lose auto curly quotes and copyright/trademark symbols, etc. but I feel this is a (very) small price to pay to eliminate XGID pasting errors 
Should be fixed now; sorry for the inconvenience.