Date Field Not Updating in Database As Date Changes

Good day,

I have created a date field (date time picker)

Settings > Customize > Fields Customization

Entity Type: Service Record
Field Caption: DB Supplied Date
Field Type: Date
DB Field Name: sr_cust_sr_db_supp_date
Internal Att Name: CustomColumn29sr

So I have placed the field on a Request Template.

This works perfectly. However, when I go back to an request and change the date, the date doesn't change in the database. It is asif the first date selected is fixed.

Please see screenshots attached, any advice would be appreciated.

Thank You
Kind Regards
Charl