You did not understand Jacob1.
Signs did duplicate but it looks like one single sign.
Delete the 'one' sign several times and you will be able to delete it at last.
Because there is a sign limit of 16 you has to delete previous duplicated signs.
Also, 16 is far not enough for me... Or I have not made my own font yet. I sometimes have like 20 parts in a save and it requires like 25 signs. I got to use my own font instead.
Also my club save, it is going to use a lot of signs... I would rather use a lot of signs instead if possible.
200 is enough.