Slashes randomly inserted on Canvas (usecanvas.com)

To reproduce:
1. Create a new Canvas
2. Type a slash, then any other character
3. Observe the extra slash placed after the cursor (also that it can't be deleted by pressing delete or backspace)
4. Attempt to delete the letter (delete produces pessimal results, backspace just inserts slashes)
5. Observe that extra slashes and letters are added after the cursor

The only way to recover from this is by selecting all text containing a slash (either with the mouse or the home/end buttons) and deleting it, as all attempts to use backspace/delete without text selected simply cause the characters to reproduce.