Hey there,
The Isle of Siptah receives base game updates as well as its own updates to flesh out the map and squash bugs. Isle of Siptah DLC-specific feedback and issue reports should be posted on the Isle of Siptah subforum.
Edit: For bugs, please check the PC Bugs and Isle of Siptah subforums for existing threads on each issue and post there. Otherwise, please make a seperate thread for each issue.
Most of the items from the Exiled Lands are available on the Isle of Siptah map. If you are experiencing an issue on the Isle of Siptah map with base game items, you can check on single-player whether the issue persists. Also, check base game patch notes for any changes which may have caused the issue.
Issue reports should follow these guidelines:
You may post Isle of Siptah or Update 2.0 related issues on the Isle of Siptah subforums. They will be seen regardless. If posting on the PC Bug subforums, include Isle of Siptah as location where relevant.