WOOF breaks order on pagination

Given a product list order by title, the first page works well. On subsequent pages, the oder appears to be random.

If I disable WOOF, then then the product ordering works as expected.

For an example, see http://theartcenterhp.org/departments/painting/

I suppose I could work around it with pre_get_posts to get all products, but it would be nice to retain pagination if possible.

https://wordpress.org/plugins/woocommerce-products-filter/