That could be very likely resolved from our side.
Can you ask if they use any special ordering arguments or are they setting it in the query args like in WP_Query? If so, can they let me know which ones exactly?
Also, is there a query argument similar to the “asp_override” or anything special that their plugin sets, so I can reliably detect if the query is related to the filter grid?
With that I can very likely add a minor modification to the plugin code to explicitly set the same ordering arguments.