Whenever i log in over the past month or so i have to move my pet window and redo all those buttons, my bags are stacked on top of each other, and the window that shows what spell you are casting is also not in its original spot. Can anyone tell me why this is happening. It's getting really frustrating.
What's mostly likely happening is that by accident, you are switching between Full Screen and Windowed mode. This can be done accidentially by pressing Alt+Enter. Each mode has their own settings saved for the UI layout and placement of the UI elements, which is of course very annoying when you don't intend to.
You can verify which mode (Full Screen or Windows) you're in by opening the Options window, click the Display tab, then see what the button says. If it says "Switch to Fullscreen", you're in Windowed mode, and vice versa. Or just try pressing Alt+Enter to cycle the modes.