If you specify multiple sources (Source 1, Source 2) in a single job and multiple targets (Target 1, Target 2), then the contents of Source 1 and Source 2 will be copied to Target 1 and also to Target 2. The list of Source paths and Target Paths are not processed sequentially, where Source 1 gets copied to Target 1 and then Source 2 copied to Target 2.
If you want just Source 1 copied to Target 1, you need to create a job with just Source 1 in the Source path and Target 1 in the Target path.