That looks like binary data corrupted to text. In my case, I have a recipe for a newspaper that inserts ads as news in the feeds. Whenever Calibre finds an ad, it corrupts the next article just like in your samples.
I have checked the RSS feed for yours, but found no ads posing as articles. By clicking on some +10 articles from your feeds, I was not redirected to ads, either. So I'm not sure why binary data is popping up here and there in your case. Sorry I cannot help.
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