The curser keeps jumping from the current spot back to somewhere where I've already typed
Are you relatively new to this laptop?
I'm asking, because I suspect that you suffer from the same problem many laptop users have, namely too sensitive touchpad. I myself had this problem with one or two laptops...
When you keep your hands low and parallel to the keyboard, it sometimes happens that when moving the hand slightly to reach keys in the upper keyboard regions, the base of your thumb just barely touches the touchpad, resulting in moving the cursor :) The base of a thumb is protruding lower than the thumb itself, and is not very sensitive to touch, so one does not feel the base barely sliding up the touchpad.
There are two solutions.
First is to go to touchpad settings, and make it less sensitive to light touch. Better yet, some touchpad drivers have a function to prevent from accidental dragging objects by light touch, which needs to be enabled.
If the driver lacks such adjustments, the only remedy is to try and position the hands a bit higher than you currently do. It may be hard at first, but it's relatively easy to form a habit of it :)
Good luck :)
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