Many themes register their own content filter of some sort. I’ve seen it on many of the themes I’ve used. The one in Royal seems to be different from the last couple I’ve had.
Here’s a clip from WordPress Codex:
The “the_content” filter is used to filter the content of the post after it is retrieved from the database and before it is printed to the screen.
A plugin (or theme) can register as a content filter with the code:
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