Strange Time-Formating Problem

I have a time*** data entry form with TimeIn and TimeOut textbox
controls. I want the users to only view/enter/update the time in
military-time format. The format of both controls are set to Short
Time(hh:nn). The input mask for both are set 99:00;0;_

This works fine most of the time. The exception is when I click on a
control that has a certain values (i.e. 12:02, 12:06, 12:14, 12:22,
12:23 ... 17:17). When I click on a control with the time 17:17, the
control shows 05:17:00 PM (instead of 17:17). When I click on a
control that has 17:16, it shows 17:16.

For some reason, the format of the short time controls got changed to
long time when it hold certain values upon clicking. When I tab into
the controls, they are OK. Please help!

Thanks.

Julie

.