Actually, looking through everything -- I'm coming to an interesting discovery.
The aggregator in question, is through iGoogle. I tried various readers, including Firefox, SharpRSS, and the readers supplied by Google and Gadgets.
Here's the interesting part. My feeds are actually outputting the intended content -- but -- anything viewed through Google, is actually pulling up the additional entries that were deleted!
Hmmm. I'm not sure what to make of this at this time, other than the possibility that Google is caching the Web's feeds and if you make a request to a feed through their site -- it will read from the cache and not from the source. Which, if this is the case -- is a little too contraversal for my taste.
Play around with different readers and see what you come-up with. I'm not seeing anything on my site that would make this happen -- unless I'm completely missing something.