I am using a select2 (advanced selection) field.
When using on a cell phone, the field initially appears in normal size (image1). But when I select an item bigger than him, the field closes the boundaries of the div. And break the form (image 2).
The field select_advanced itself has the CSS code to avoid the text display overflow the select box. Can you please deactivate all plugins except Meta Box, MB extensions and switch to the WordPress theme to re-check the issue?