I logged into Minecraft and the cursor changed into an x, y, z plane.

What I expected to happen was have a normal Minecraft Cursor
I thought the cursor would always be the Minecraft cursor

What actually happened was when I logged into Minecraft the cursor changed.
I didn't change anything at all, all I did was load up the map, no texture/resource pack, nothing.

I honestly have no idea
1. Log into Minecraft
2. Quit then relog.
3. Play a world.