I've found a strange glitch that I've never noticed before in the app.
When I highlight a section of text and press delete, it deletes extra characters. If I type a letter instead of delete, it just puts in the character. I first discovered this with a double tap to highlight a word and kept loosing extra characters but holding on the screen and highlighting multiple words also:
Initial sentence, highlighted two words
After pressing the delete key it has also deleted "and if the..."
This is what happens if I just type the letter "k" notice the rest of the sentence was intact.