At level 21 Guided arrow is supposed to increase damage by 100%, but it doesn’t.
Hi there 
This forum is for issues with the Desktop Launcher application. If you have issues with a particular game, you would want to ask about it on the game forums and then, if it is a bug, post it on the Bug Report forums.
Here are the D2R forums Diablo 2 Resurrected Forums
You can likely get help from other players about your build and find out if it is a bug or not.
You can also try a lot of the other websites like maxroll who have guides and calculators.
can post ANYWHERE we want since Bliz doesn’t care or even read them