What does your render field method look like?
Given the example in the field type template it should probably look something like
?>
<input type="text" name="<?php echo esc_attr($field['name']) ?>[field1]" value="<?php echo esc_attr($field['value']['field1']) ?>" style="font-size:<?php echo $field['font_size'] ?>px;" />
<input type="text" name="<?php echo esc_attr($field['name']) ?>[field2]" value="<?php echo esc_attr($field['value']['field2']) ?>" style="font-size:<?php echo $field['font_size'] ?>px;" />
<?php
You should notice that I turned the value into a nested array and I’m also echoing out each of the values of this array independently.
I’m not 100% sure that this is all you’d need to do. You may need to also do some work on the save_field and load_field methods and you’ll certainly want to do some work on the format_value method.
