Userform combobox只接受第一个值—Excel VBA

I have a user form set up which contains a ComboBox. The ComboBox is populated with values from a dynamic named range "List1" .. every thing is Fine .. when I choose the first value from the list it works and I could complete my tasks .. but when I choose another value from the list the value disappears and the combobox value become empty .. here is the code :I have a user form set up which contains a Comb