Do you have very large hands or a narrow keyboard? On a normal 85-key "75% keyboard", I cannot reach the up-arrow key with my pinky while the rest of my fingers are on the home keys.
I've had similar cursor problems with those keyboards that have page-up and page-dn next to the up-arrow key. Just a little finger displacement when trying to left-arrow and the cursor is suddenly inserting my subsequent typed text far from the intended location.
I've had similar cursor problems with those keyboards that have page-up and page-dn next to the up-arrow key. Just a little finger displacement when trying to left-arrow and the cursor is suddenly inserting my subsequent typed text far from the intended location.