grep-find: first ':" char is a zero

[jonetsu]

The first character ':' after the filename in grep-find turns out to be
a zero.  The second is a legitimate ':'.  Both are shown as ':'.  This
means that the line numbers for each find are in between a zero and a
':' even though they look like being between two ':'.

I found this when searching (C-s) for a ':' from the beginning of a
line.  It would not stop at the first ':'

Is there a way to configure the grep-find results so that an actual
character is used instead of zero ?