I'm not sure why you are encountering this behavior. Can you please send us the .AIP (project) file you are using to support at advancedinstaller dot com so we can investigate it?
Unfortunately, we cannot replicate this behavior on our test machines. Can you please isolate the behavior on a fresh project with dummy files and send it to us via e-mail so we can take a look? Also, please send a description of each step we need to perform in order to replicate this issue.