When you add a value with a space to your multipicklist and render it as checkboxes, the following happens:
The first word will be the for attribute of the checkbox label, with the rest of the String it does something weird.
When you add a value with a space to your multipicklist and render it as checkboxes, the following happens:
The first word will be the for attribute of the checkbox label, with the rest of the String it does something weird.