I came across this by pure accident
If you follow a word with a pair of full stops. That word gets copied into the start of each new paragraph and every paragraph following that gets appended by the paragraph above it
EG:
bullet.. sentence1
sentence2
sentence3
This gives you:
bullet.. sentence1
bullet.. sentence1sentence2
bullet.. sentence1sentence2sentence3
It looks to me like it could either be a Textile bulleting technique that I'm just not utilizing properly (Although I don't see any hints in the Textile Documentation) or some glitch