Hello,
In order to progress on your subject, can you process some tests in order to better understand the context.
1. Process a test with by example ProtoStar to see if that work with a default template or change something, and make your returns about these results.
2. In order to experience your issue, provide an Url link and a step by step process to reproduce it.
3. Add your filter screenshot configuration.
4. Details the issue, especially if it's not that obvious, like by example results display products from another category while the filter designates another category.
Awaiting your elements to be able to progress on your subject.
Regards