product disapear

Hi, well actually I have been two problems:

1.- I can’t add more amazon′s products in my old post. Why?
2.- Recently I have had several post with products that disappear. For example, If two week ago I wrote a post with 10 products, only I can see one of they and I can’t add more because the plugin don′t add them (the number one point)

For this, I have to publish a new post, with the same text and start again to add products.

Can you help me with this question?

I would thank you a lot