im making some races for a campaign i wan to try to run as my first game as dm and im struggling to set this subraces unarmored ac as 13+dex. i already know is adds dex to the ac in the first place i i cant specifically make the ac 13 and i been trying different things plz help?

racial trait in question:

Hardened Coat.

This natural armor lets you calculate your AC as 13 + your Dexterity modifier when you're wearing no armor. You can use a shield with this and gain the benefits of both.

Modifier: Bonus—>Subtype: Unarmored Armor Class—>Fixed Value: 3

PS- This isn’t a Bug nor is it a Support issue. There’s an entire Homebrew forum for asking questions such as this in future.

Ok thank you also double thanks for the ps I’ll try to be sure to post in the right area next time 

Happy to help.