Double Expertise

Hi, i have a simil issue: i've build a scout rough, with a ranger biclass. I have (with scout) proficiency in survivor (+3), and that give me a x2 of proficiency bonus, that's means is a +6, but, because i have a ranger (before beeing a rough) i already have a survivor proficiency. With the first level of ranger, i use the optional feature of tasha to use (expert explorer) that give me a x2 in one of my proficiency that i choose, and i chose survivor, so i have a x4, thats a +12. When i chose rough, i have to choose a proficiency that i want to give a x2 at proficiency when i roll (maestry), but, if i chose nature, that's give me a +24!!! if my basic stats in Winsdom is +4, i have a +28. Sorry for my english, but can someone say to me if i'm wrong

DDB is not the game.  The builder lets you do many things that violate the rules set out in the books.  You can add +3 to an ability score during character generation, you can take the Archery skill multiple times, you found another.  It happens.