Dropdown first item not selected after move down

Hello, please tell me how to fix it.

I made it possible to change the ordinal number (position) in the list of the element and everything works great, but there is a problem - when the page loads and in the dropdown we did not click on other options, and when you click on the down icon - then the item we are editing does not remain in the selection, but the first one from the database is substituted (ie the tick is not left on the element that we just changed).

If you click the selection and choose some options (and even choose again the first item) and then do up / down - everything works correctly.

I capture this problem in video screencast:

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