Is it normal for the A/C to be dripping from top pvc that's coming from attic?
When the forced air unit is in the attic sometimes the condensation is drained into a normal interior drain and a second, outside drain is used for overflow.  The overflow drain is in a visible place so you know that the main drain isn't working and you can fix it.  In fact I had this very problem a few weeks ago.

If you remember being told it should never drip from the upper drain, it sounds to me like it could be a secondary overflow drain.  In that case it would be worth getting it checked out.