YPosition Problem with Graphics.DrawString C#

Today'm trying to Print a Ticket in a MiniPrinter Using C#, My Problem is when i try to Set the YPosition more than 85 For Example:

gfx.DrawString(headertitle, printtitle, myBrush, leftMargin, 80, new StringFormat());

Result: The Print is In Range

gfx.DrawString(headertitle, printtitle, myBrush, leftMargin, 90, new StringFormat());

Result:开发者_StackOverflow Appears only half of the letters, it looks as if They were exposed out of range

I Not really understand my problem, because this printer uses paper tape and should not have a range