excerpt-include macro is not rendering wiki markup correctly

The wiki markup is not rendering correctly when pulled into a page via an excerpt-include.
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e.g.
The URL under the 'Cron-Based Scheduling' point in the document below is not rendering as a URL, but as the text of a URL:
http://confluence.atlassian.com/display/BAMBOO/Triggering+a+Build+on+Schedule

It is excerpt-including it from this page, which does render it correctly (see first sentence):
http://confluence.atlassian.com/display/BAMBOO/Specifying+a+Cron-based+Schedule
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I've also had to remove curly brackets from font formatting markup, (e.g. {_} is sometimes used to format text to italics, instead of just _), as it was also not rendering it correctly in an include.