I thought his would be the simplest of macros !

I need to add "19" to the beginning of the description of an asset to
correct two digit years to four.

I recorded my steps ie. F2 key , then home then right arrow the 19 then an
enter key to move down to the next cell.

If the next cell needs correction and I run the macro created by my
recording, rather than correcting the new cell, ie. adding "19" to the
beginning, it inserts the corrected contents of the previous cell on which
the macro was run.

Engaging the relative reference key does not help.