Cursor Jumping when I hit spacebar in Rise

I am also experiencing the same issue, not just the spacebar. The issue appears to be random, and I have noticed that even copying and pasting text into RISE can cause a jump. 

When I try to delete text by highlighting several words and hitting the delete button, then start typing, I often experience sudden disappearance of my typed text, and the old text reappears as if I had hit the 'undo' button. 

Furthermore, sometimes the deleted text reappears without any further typing. For instance, I would select some words, hit delete, and the text disappears, but after a while, the text reappears and then disappears again. This happens even when I keep my hands off the keyboard.