The colors in your design can be off for a few different reasons. Print ready artwork may look a little off online and thats because each computer monitor is different and will out put colors differently. The best thing to do is to print out your files and proof them before submitting. As long as your artwork follows the guidelines we have listed for each print process, then you should be good to go.
If you need more information, have additional questions or just can't find the answer to your question here, please submit a support ticket and one of our account managers will be happy to help.