This looks to be an issue with the rewrite rule. To test this I would recommend disabling the
vBSEO that maps dto_vendor.php?do=reg
Once this has been disabled go to
Jeep Wrangler Forum and see if the problem continues.
If it does resolve the issue take a look at our docs to insure that the
vBSEO rewrite rule is configured correctly.
In either case if there is still a problem feel free to
open a ticket and I'll dig into the issue further.
Thanks
Mark