Hi Ozz,

I don't know what it is but you can get rid of it by selecting
columns A,B + C and deleting the entire columns.

If there is other data in these columns that you wish to keep
you can insert 3 new columns to the right of the object
copy and paste the other data to there and then delete
the columns. You will need to copy and paste one column
at a time otherwise the white line comes with it.

HTH
Martin