If you have connected wires to your Touch Board, Messy and / or moving wiring can cause this problem. If your wires cross over one another or move with relation to one another this can register as a “touch” so be careful to keep wire separated and carefully physically fixed.
When the board first turns on, it spends a few seconds finding a background capacitance level against which to detect touches. If you are finding the board behaves strangely when you touch it soon after switching on, try giving it 10 seconds to adjust after switch on before touching it.
If you are using very long wires between the board and you electrodes, consider using shielded cable with the shield connected to the ground electrode at the board end only. This will help avoid accidental touch triggers.