This query works until filter.Exported and filter.Ordered are null but when they are true or false, it returns unexpected items and I don’t know why

public List<ProductResponse> GetProducts(ProductFilter filter) 
        {
            List<ProductResponse> products = _db.Products
                .Include(db => db.ProductType)
                .ThenInclude(product => product.ProductCategory)
                .Where(product => string.IsNullOrEmpty(filter.ProductTypeId.ToString()) || product.ProductTypeId.ToString().Contains(filter.ProductTypeId.ToString()))
                .Where(product => string.IsNullOrEmpty(filter.ProductCategoryId.ToString()) 
                || product.ProductType.ProductCategoryId.ToString().Contains(filter.ProductCategoryId.ToString()))

                .Where(product => !filter.Ordered.HasValue || (bool)filter.Ordered 
                ? _db.OrderedProducts.Any(orderedProduct => orderedProduct.ProductId == product.Id) 
                : !_db.OrderedProducts.Any(orderedProduct => orderedProduct.ProductId == product.Id))

                .Where(product => !filter.Exported.HasValue || (bool)filter.Exported ? product.ExportDate != null : product.ExportDate == null)
                .Where(product => string.IsNullOrEmpty(filter.ProductionDateFrom.ToString()) || product.ProductionDate >= filter.ProductionDateFrom)
                .Where(product => string.IsNullOrEmpty(filter.ProductionDateTo.ToString()) || product.ProductionDate <= filter.ProductionDateTo)
                .Where(product => string.IsNullOrEmpty(filter.ExportDateFrom.ToString()) || product.ExportDate >= filter.ExportDateFrom)
                .Where(product => string.IsNullOrEmpty(filter.ExportDateTo.ToString()) || product.ExportDate <= filter.ExportDateTo)
                .Select(product => new ProductResponse
                {
                    Id = product.Id,
                    ProductCategoryId = product.ProductType.ProductCategoryId,
                    ProductCategoryName = product.ProductType.ProductCategory.CategoryName,
                    ProductTypeId = product.ProductTypeId,
                    ProductTypeName = product.ProductType.TypeName,
                    ProductionDate = product.ProductionDate,
                    ExportDate = product.ExportDate
                })
                .ToList();

            return products;
        }

I’ve tried the string.IsNullOrEmpty approach but I had the same result