presumably if your wallet has synchronized to the right height (currently 82178) then by definition you're on the right chain. I ask because the Syscoin version I'm running is
v0.13.00.0-dc8186d (64-bit)..... and I'm easily confused. Do I need to upgrade?
You still need to delete all your old data before upgrading. Of course backup your wallet.dat first then delete all the old files under roaming/appdata/Syscoin and try again. Please join us in slack for troubleshooting.
join.syscoin.org