Javascript datepicker problem

[dros...@gmail.com]

In a Lightning (jquery) detail form I have a datepicker defined with this script:

<script type="text/javascript">

$( '#\\.Ltg_CPAgreementSigDate_d' ).datepicker({

  changeMonth: false,

  changeYear: false,

  yearRange: "-0:+0",

  dateFormat: "mm/dd/yy",

});

</script>

When a user clicks the OK button in the form, 4D code does some data validation checks on all of the entry fields and if there are any errors returns a message via Ltg_JS_Send. This works fine, except that the display of the above date gets scrambled. If the user selected 06/23/2021, after the error message is sent it changes to 11/06/2022.

Any suggestions for fixing this?