You might get some help if you explained which version of Archicad you have and possibly supplied some screen images of your setting & what you think is going wrong. The new beam tool in AC23 works different to walls for instance. Without knowing what you are doing it will be difficult to determine if this is a bug or just a setting is wrong.
Apple iMac Intel i9 / macOS Sonoma / AC27UKI (most recent builds.. if they work)