eZImage datatype only allows settings a maximum file size in MB units. But unless the images are photos, then 1 MB is too much. Specifically when you want to show the original image.
Option 1: change units from MB to KB
Option 2: store the value as a decimal number in data_float1 instead of data_int1
I can create a Pull Request for this. But I don't know how much backwards compatible I should be.