When I change the page size on a category search page, some products (grouped products) are removed after playing with filter/page size.

Step to reproduce:
1. go on https://www.zefir-outillage.fr/clé
Initially there are a total page size to 22
2. change the page size
the total page size change to 19

All the grouped products are removed.

Well, it's a known issue. For now, grouped products are not supported by filters.