I have a view of home floor plans that is set to order by a custom field for square feet, but it's not sorting correctly.
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Weird thing is, my local copy of the site was sorting correctly at one time, with version 1.5.3... However, when I downgraded our staging site to this version, it's still showing the wrong order.
During troubleshooting, I noticed that a third-party plugin "Post Types Order" is affecting the order of posts in general on your website.
If you'll go to WP Admin -> Settings -> Post Types Order and uncheck the option "Auto Sort", you'll see that the results will be ordered by the 'sq-ft-from' field, as expected.