Inventory controls messed up

im using a different computer than normally do, and it seems to have a weird little ANNOYING issue with the inventory. i cant simply click a block then click it where i want it to go and be done with. i have to hold down the mouse the entire time, if the block hovers over empty space it places one block, i also cant replace blocks in my inventory, they snap back to where they were, its very very annoying. shift clicking seems to also be broken in inventory
Sorry if bad english
~Xepher