If you copy and paste anything into the WYSIWYG editor, it automatically adds BB code to enforce its original style, even if it's from the forums so has that style already.
OS: Windows 10 64 bit Professional
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT
CPU: AMD Ryzen 5900X
RAM: 48GB
GPU: Radeon 7800 XT