For some Vr users, B&S will slightly miscalculate the length of your arm. The game will start with the option of dropping your weapon when the max arm length it believes you have is reached. This will mainly come into play when performing an overhead or sweeping strike, leading to many slashes lacking a blade and a lot of ground or walls with a weapon in it. First, Open up the menu using the menu button on your left controller.  Then, go to the options menu using the submenu hovering over the book. It should look like a cog/gearwheel. Finally, change the 'Max Arm Length Reached' option from DROP to BLOCK in the general options.