problem with Ctrl-h behavior

Hi, I really love this product, but it seems like there's something wrong with the behavior when I keep pressing Ctrl-h key.

I expect it to delete characters backward. Yes, it does, but when the cursor comes to the beginning of the line, it keeps deleting the prompt and even further (the lines before).
Additionally, when I retype a command by deleting some characters with Ctrl-h and run the command, "command not found" error appears.
It seems like the string on the command line is not what I perceive it is.

I hope this problem will be solved soon.

Thank you.