Wrong marked_choices in a good image

[PedroAugustoRamalhoDuarte]

Hi, first of all, congratulations to the awesome lib!! I'am trying to build an small application to manage exams with rails, and I was testing this image above, that is ok to me, but the system dont get the responses. Is there something that i can do?: Response image:

Layout used: layout = { header: { name: {top: 5, left: 15, width: 160, height: 7, size: 14}, title: {top: 15, left: 15, width: 160, height: 12, size: 12}, code: {top: 15, left: 155, width: 35, height: 10, size: 14} }, reg_marks: { radius: 3, crop: 20, offset: 2, blur: 2, dilate: 5, contrast: 20, } }

Marked Choices: