Multi files upload form problem

I'm creating a form that allows users to upload 11 images, i have 11 input fields for the user can select an image for each. The problem is that i can only upload the images from the first 5 input fields, the rest i cant.

What can be the problem? There are some limitation of the number of Input fields for each form? Any idea?

Thanks Brun开发者_JS百科o

Maybe the post on submit is too big, try smaller images see if you can upload more than 5