# when I perform:
printf "\n\t%-25s| %-25s\n", 'Filename', 'Comment';

# I get on STDOUT
Filename                 Comment              # please note the spacing

# when I perform
printf "\n\t%-25s| %-25s\n", RED . 'Filename' . RESET, UNDERLINE . 'Comment' . RESET;   # the same spacing as above

# I get on STDOUT
Filename          Comment           # each underlined, but the spacing is changed somehow