Added Custom field (Checkbox type) loses text when editing

1- Added new custom field of type checkbox with a default text value
2- Above field added to view screen and all transition dialogues and create issue dialogue and edit issue dialogue too.
3- Upon editing noticed the following: after editing the fixversion field, and then when trying to edit the above mentioned custome field, the text for the custom field disappears and the field shows in abnormal shape ( view attached screen shots for 1-trying to edit the field before editing fixversions, and, 2-trying to edit the field after editing fixversions)