Hideout portal effect change bug?

I changed my portal to another one in my hideout (the rust king portal effect) and used it for a while. Then I turned off the cosmetic to get the default portal back.

My hideout and all maps show the rust king portal effect. Even restarting the game doesn't fix it.

Other areas show the correct portal if I port to another area.

Edit - it appears that if you have an active portal on your hideout, maps and your portal don't refresh but other areas do. After closing all portals and starting another map after choosing another portal cosmetic it started using the new one. So perhaps the only bug is a slight visual one whereby existing portals don't refresh their cosmetic effect?

Not a bug - that's how the portal cosmetics work. Existing portals keep the effect that you had on before you changed it. Run a new map, and the map device will use the new portal skin.