Content in dropdown get by Microflow was cleared

Hi everyone, I have a dropdown bar problem. I created a Widgets , and inside there was a dropdown. Data container widget I use Datagrid, create dropdown using Widget Reference selector. Dropdown data is taken from the database + add some records. The added data is still visible and selected normally However, when selecting an item added with microflow and clicking button search, the value of selected dropdown is cleared, while selecting the item in the database is not cleared. I tried debug, to check data selected was lost but it still existed. I also tried to add the value I chose for the dropdown, but the dropdown bar also didn't show the value. Does anyone know the cause? I look forward to receiving support. Thank you
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