This is something different then.
When you check the channel *before* updating it manually, are the new items there? If not, then there's nothing Awasu can do - it can't tell you about items it hasn't received yet.
If they are there already but you have not seen any balloons for them, this is quite common. Balloons get queued up and are shown in the order they are queued so there can sometimes be a long delay between when a new item is received and its corresponding balloon is shown. Also, if the queue gets too long, balloons can be discarded (they chew up memory).