Cindy,
On my laptop, shrinking the browser window to about 2/3 the screen width causes the problem on your site. I estimate the problem starts at about 666 pixels based on a 9.25 inch browser window, 72 screen pixels per inch, on a 13 inch wide screen. See attached image. MacPro 15 inch (diagonal) laptop, 2014 vintage, Firefox browser (v85.0).
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