Percentage Colour alteration??

Hi There,

I am brand-new to this forum, so hello to everyone!

This is my problem, I have designed a colour booklet and sent the pdfs to the printers, they have come back to me with the following regarding 4 images:

photos on page 12 has about 383% and 400% colour. It should not have more than 350%

Can anyone explain this to me and how to correct it? I am using Photoshop CS.

Thanks in advance. Ella

thanks Elia7890 for the link .I'm also not good at editing color of picture .