The cursor keeps jumping around as I type. Won't stay put

I create tables for my knitting patterns. On any line the cursor will jump to another location within the table. Is there a setting where I can stabilize the cursor?

I had this problem. Traced it to the fact that my laptop had a touchpad to control the cursor location, and it was affected by the movement of my hands. (Static electricity or something.) I got a remote mouse and installed it, and have not had the problem since. (I tried adjusting the touchpad sensitivity etc. without success.)