Let’s test a known example: “thmyl” is often a shifted version of “” — yes! Try left shift on “signal”: s→a? No. Let’s reverse-engineer:

t→r, h→g, m→n, y→t, l→k → r g n t k (rgntk? That doesn’t look like English. Hmm.)

Known trick: If you type a word while your hands are shifted one key to the left on the keyboard, you get this effect. For “signal” typed with hands shifted left: s (right hand shifted left) → actually, let’s map correctly: