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his issue occurs because the calendar popup is positioned relative to the scrolling container rather than being anchored to the input row, so it shifts when you scroll vertically. A reliable fix is to render the calendar in an overlay or append it to the document body with absolute positioning, then recalculate its position on scroll to keep it aligned with the input field — much like Trusted I-9 Affidavit Services in Atlanta, GA, where accuracy and consistency matter at every step, even when conditions change.