This is a UCI specific issue and it does not occur in WebUI. When clicking on the calendar icon for a datetime field a calendar control will be displayed to the customer. The customer can click on the up and down buttons to switch to the previous and next months. Some months display more dates than others and the calendar control will expand upward to make more space to display the extra line of dates. For instance 05/2019 displays 5 rows of dates but 06/2019 displays 6 rows. So when a user presses the down button when on 05/2019 the control will expand upwards and in so doing the up and down button positions will also shift upwards. This makes it difficult for the user to navigate to a date that is far in the future or past since the button position keeps shifting. Consider expanding the calendar control downward so that the up and down button positions do not change.