Most storage sites show unit sizes, prices and availability through a widget from their management software. Many load in an iframe or after the page loads, so Google may miss the prices or credit them to the software company's site. I check each location page in Search Console and add sizes and "from" prices as plain text where they're missing, kept in step with the widget.
Advertised prices also carry rules. In California, the honest pricing law requires the advertised price to include every mandatory fee, such as an admin fee or a required lock. Several other states, including Minnesota, Virginia, Colorado and Massachusetts, now have broad all-in pricing laws too. Rate pages are written so the price renters see is the price they pay; confirm the details with your own counsel.