First, when running jobs from DI Studio, it is a matter of executing SAS programs through a workspace or a batch server. Having said that, when you say ".. DBSLICE in Base SAS.", do you mean through a DMS SAS session, or a source editor window in DI Studio, or...?
So, you have to figure out what's different between how you run your code. This involves comparing programs, logs, options settings (system, Libname and optional table/data set). I'm afraid that doing this type of analysis the Forum is not the best suited arena. If you need further help, SAS support might be your best friend.