Problems in using API connector getting shopify products

Hi all , I need help ! When I use API connector to get shopify product , it alays some products missing . I understand there is limitation in the number of products API connector (only allows 250 products in each catagory?) but I only have Max. 68 products in each catagory. the problem is it seems can only get around 44 products in each category . Does anyone know the reason? thanks so much!

How many categories do you have?

24 category only

when i listed according to alphabetic order , i found that in API the 39th product start missing

but in some category start missing products at 56th products (according to alphabetic order)

Does the variants also count ? since each products may have serval variants

but my pull down structure is like this :

thanks