Greetings Exile,
Thank you for your report. Can you please share your saved file with us?
You can find it by following:
Steam\steamapps\common\Conan Exiles\ConanSandbox\Saved
It should be the “dlc_siptah” for Isle of Siptah.
Please upload it to Google drive or to a similar platform of your choice and share the link with us.
Feel free to reach out in private via direct message if you prefer.
Thank you in advance.