DTS woes

I've created a DTS package with the data-export wizard and customized it in visual basic (to do some transformations) When I run the code, No errors are logged, but I'm loosing a massive amount of rows on some of my tables. I'm just moving data from one db to another on the same server. When I do this twice with the same source, I get different results. I'm completely lost here :-(Duh! Nothing to to with my DTS-Script. A lot to do with me confusing backup names on my test server. Stupid me.