Backspace in old school vi

That command worked.

: uname -a
SunOS ah5719006ub002 5.10 Generic_150400-64 sun4u sparc SUNW,SPARC-Enterprise

It acts like it is working. The cursor jumps back so I can overwrite what I want to delete. Then my cursor jumps up a line and starts adding random capital D and P on new lines.

D
D
Pa
P
P:
P
Can you please work backabcdefghis

Yes I am using putty.