When the table is refreshed, random scrolling occurs

Good day !

Could you please clarify the following situation. I am facing scrolling issue when updating a table.
The code refreshes the table data with a period of 1 second without changing the number of rows. If you select a row in the middle of the table so that the scroll bar is positioned between the top and bottom, you can observe arbitrary movement of the table rows and the current position of the scrollbar up / down.

Thank you !