Printing on 1 on 1 transparency means that the object (item) that you want to print is 100 % transparent. There is no other explanation for this process. Transparency is the property which allow the light to pass. In your case, 1 on 1 represents full transparency. If the final items isn't printed as you want, this might be caused by the program's limitation or a malfunction with your printer. In the first case, I suggest that you contact the program's developer using its official website to learn more about this issue. Regarding the second case, you should probably check the printer's ink cartridges. A low ink cartridge might cause bad printing.