When the Track Changes is enabled and a <p> element contains nothing but whitespace (newline, space or tab characters), any time one character is deleted, the entire element is deleted 

Another issue relating to this, is that when the line is deleted, if there is another whitespace <p> element above the element, the cursor is placed not on that line, but on whatever line is next without any whitespace. 

This behavior can be reproduced in the track-changes demo (Found at https://demos.telerik.com/aspnet-ajax/editor/examples/trackchanges/defaultcs.aspx ) ,by following these steps:

1. Create a <p> element containing some text
2. Below this element, create 3 more containing nothing but whitespace
3. On the last line enter a space and then press the backspace key

The cursor will be moved to the <p> element containing text and the entire element will be deleted (not just the space which was entered)