Time entry on UserForm displaying inccorectly and calculation not working on the time.

Good Day

I have a User Form whereby time is added. (See attached Form) I have created a lookup for time and created a drop down on the Form. However after I chose the required time it is entered into the form as a decimal number and also placed in that same format on the sheet. The lookup is in the Time Format. I then need to subtract the start time from the end time. This also does not give total time.

What am I doing wrong?
Please Help.

Thank You
Colin Smit