Mine did that too, this was due to mine been synthetic... but i washed them and thoroughly brushed them and the bulge was gone! I now buy reall hair and a good comb now again avoids this happening.
Hope this helps
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<font color="#ff99cc"><div align="center"><font size="3" color="#ff99cc"><strong>All about the Fashion Babyyy...</strong></font></div></font>
I'm not a fan of extensions myself, too much hassle. You get a volume look simply by using large rollers, no need for extensions at all (though they are v popular at the moment)