query of query not sorting properly

I am using query of query to run against a product search using verity.  I have sort buttons that can sort the results by name or price, asc and desc.  When sorting by price, it is not sorting properly.  Here is an example:

$110.00

$110.00

$115.00

$124.00

$24.00

$36.00

$40.00

And so on.  What is going on?  Is there any way to fix this?  Thanks.