I am left handed. When I have my mouse in left handed mode, in windows 10, minecraft: Windows 10 edition acts weird. When I click button 1, the function assigned to button 1 and button 2 happen, but button 1 happens basically a nanosecond before the button 2 function. This causes me to break, then immediately replace a block when i only want to break it. When I click button 2, the function assigned to button 1 and button 2 happen, but button 2 happens basically a nanosecond before the button 1 function. This causes me to place a block, then immediately break that block when I only want to place it. If i change one of the controls on my mouse to a key, like P, or a mouse button other than buttons 1 or 2 (like button 3, which is usually set to pick block), and use the mouse button that i did not change it functions fine. When I use the mouse button of the other one that i did change, which now has nothing assigned to it, and should do nothing instead preforms the function that the other mouse button does. This control configuration causes mouse buttons 1 and 2 to do the same thing. Also if it hold one of the mouse buttons and move around the mouse with minecraft's default controls applied, it preforms the function of the other mouse button. Everything i have mentioned so far happens when my mouse is in left handed mode (when your primary button is set to right), like i said in the beginning of this message. Now, strangely, when i put my mouse in right handed mode (when your primary button is left), all bugs disappear. Now, i prefer playing minecraft with my mouse in left handed mode with the default controls applied. If you would be so kind, please fix this bug in some kind of update. If you do, i will be very very grateful.