Admin products search returns 404

When searching in admin for certain products Im getting a 404 page but dirrected ot he front end of the website and not admin? .
Not all products just random ones , does anyone see how with this link, porudtc are live and available, but i dont knwo why the 404 gernerates on the storefront pages.

/mytestadmin.php?type=simple&pcode_from_q=Y&is_search=Y&q=warden&dispatch%5Bproducts.manage%5D=Search&subcats=N&subcats=Y&free_shipping=&status=&sort_by=price&sort_order=asc&period=A&rf_search_no_images=N&rf_search_no_additional_images=N&rf_empty_qty_discounts=N&rf_empty_features=N&rf_search_no_description=N&rf_search_no_short_description=N&rf_search_name_copy=N&rf_search_product_code_copy=N&rf_search_meta_title=N&rf_search_meta_title_copy=N&rf_search_meta_description=N&rf_search_meta_keywords=N&hint_new_view=Name&security_hash=e5a65fa29a070197355bd744dbf0bd0a

Start from increasing values of the post_max_size and max_input_vars PHP settings

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