RuneScape Clicking Problem?

I logged in today and was training range and 3/4 of the time I would click on something it would like go past the thing you wanted to click on and hit the floor. For instance I would right click to pick up an item and then left click to pick it up, but it would ingnore the item I want to pick up and click onto the floor and it did the same thing when i would have to right click and then left click attack to people and it would like ignore the attack and click on the floor. Anybody else having this issue or is it my mouse?

 

It happens when you use resizeable sometimes. Just maximize the window and then bring it back to the normal size you use it.