The field for "is staff" in the client creation does not store data

When you create a client and select the field "is staff", it is selected but after submission and come again to edit, you find the field not selected, which shows the value was not stored.

For your reference I am giving the Client details in Demo site: Test Client-Migrated-10 Client #: 000003301

This issue is from the current version of demo site (Version 17.07.01.RELEASE).