Cannot select :05 when scheduling custom code email

When I select the scheduled time and I select the hour it is fine but when I select the minute from the drop down menu, if I select the :05 from the drop down menu, when I click it and close the drop down menu, it doesn't show as for example 12:05, it shows as 12:00. It does however get sent at 12:05 but it is really confusing and I am asking to please take a look at this. Thank you.