When editing the node name in source view of jPDL the editor behaves abnormaly

In graphical process designer (jBPM process) using source view when you try to change the name of the node (the node ithat is being referenced in the process) "Backspace"/"Delete" key behaves weiredly, the cursor position is not at right position so it skips some of the text and when you try to type instead of outputing the text from left to right it outputs the text from right to left for example if you type "Hello" it will type as "olleH".