Product dropping out of categories randomly -Apsona

I'm having an issue with a product randomly dropping out of the category/categories I placed them in. Using Apsona to import and Ceon URI Mapping for addons. I was having the problem before without Ceon so its either an Apsona issue or something with Zen-Cart. I cant figure it out...an example of whats happening is as follows:

I import products to categories with Apsona, check my store and everything shows up fine, category has say 3 items. I browse around and test links and images and within a few minutes the next thing I know I'm missing 1 product from the category, which now only shows 2 items. BUT when I go to "All Products" it shows up there. Its never more than 1 dropping out of category and its usually the same one that keeps acting up until I import more products, then another one will start to do the same thing.

Any help on this issue from Apsona or anyone would be appreciated.

Thanks,

Matt