It sounds like you are not getting any blue ink out. Do your testing on regular paper NOT edible sheets.
Check your printer manual and online troubleshooting information for how to clean the print head and how to check colour balance. If this is a new printer, contact the place you bought it from as they will have to repair or replace it. Remember to put the OEM ink cartridges in and print with them a few times before you take the printer to the dealer.
What kind of ink and cartridge are you using? If you bought this from a cake supply, email them and tell them there is a problem.