Some product combinations are not displayed

[Carlos]

I have seen some weird behaviour on product combinations.

The problem it seems related to some sizes

 

Example 1:

url: https://shop.atosa.es/es/disfraces-carnaval/disfraz-flamenca-nina-infantil-3295.html

 

This product has 4 combinations and only the main has quantity>0 but only are showed combinations with quantity=0

Example2:

url: https://shop.atosa.es/es/disfraces/disfraz-tortuga-unisex-bebe-6393.html

 

This product has 3 combinations. The main with quantity=0 and the others with quantity>0 but only display the third combination.

 

 

I have found problems with products that has the following sizes: 0-6 meses, 6-12 meses, 12-24 meses y 3-5 años. ( months and years is the translation).

 

Product combinations for other sizes are right. Only fails on those sizes.

 

I have searched on the dabase to compare the right product combinations and the wrong but I see the same structure and data.

 

Any idea or clue about this isssue?

 

I use the old 1.6.1.18