It was a glitch from the DLC itself back in the day, but you can fix it even in a non-modded/non-JTAG/non-RGH console using X-Packer and Horizon.
01) Copy the save data from your SvR 2011 and rename it from "SaveData" to "SaveData_raw" on your PC. Also, make a backup copy of it, just in case. You can name the backup as "SaveData_raw_backup".
02) Open Horizon and drag "SaveData_raw" to it. Go "Contents", then right click and "Extract" the only content inside "SaveData_raw";
03) Rename th