Hello PATRICIA ,
Thank you for your review! I sorry to hear that the lavatory unit is not what you expected, but I will be more than happy to help!
The Delta Windemere model B3596LF-OB mounting hardware needs to be flushed to the counter before threading in the tightening screws. You may need to loosen the tightening screws before installing the hardware to ensure a tight fit. Please view Page 2 Section B of the installation guide below.
Installation Guide -
https://images.homedepot-static.com/catalog/pdfImages/c3/c32fda42-9c76-49b9-a98e-3703eb0f15ac.pdf
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Best Regards,
Emma