check box drop down - account drop down not displayed properly.

1. https://13.127.15.161/
2.  login as admin.
3. Go to account.

Bug:-
1. Go to account > customer > create customer observe that drop down not displayed properly customer all dat a table.
2.account > reseller > create any reseller observe that drop down not displayed properly resellar all dat a table.
2. Right side add-on button doesn't display properly when dropdown data.   

Expect:-
1. Drop down should display properly check account and resellar all drop down field.
2. Add-on after drop down should display properly