Bootstrap accordion collapse height issue

i have been using the collapse module for a while but have now found an issue with items that are quite long eg. more than a few paragraphs. It seems that depending upon the number of items you have a height attribute is added to the outermost div as per below: ``` div class="accordion in collapse" id="accordion2" style="height: 348px;" ``` So when you expand an item it only expands to the height given above. If I un-check this whilst in developer mode it all works perfectly. What I can't find is where in the bootstrap.js it adds this style attribute.