Sounds like you're using out of date mods, or opted-into an old beta branch.
Right-Click Stellaris -> Properties -> Betas tab, the drop down should say "None"
Turn off all your mods, and verify your local game files
Right-Click Stellaris -> Properties -> Local Files, and Verify local files.
Reload the game and see if the issue persists, if it does go to support.paradoxplaza.com and open a ticket, and Customer Support will be able to help you fix this problem.
Right-Click Stellaris -> Properties -> Betas tab, the drop down should say "None"
Turn off all your mods, and verify your local game files
Right-Click Stellaris -> Properties -> Local Files, and Verify local files.
Reload the game and see if the issue persists, if it does go to support.paradoxplaza.com and open a ticket, and Customer Support will be able to help you fix this problem.