If you enter text that exceeds the width of an <input type=text> field, then try to long press and scroll back, it doesn't scroll. Reproable on the components CSS page. Originally filed this under React-Bootstrap, but affects the live Bootstrap.js components page as well.
This does not appear to be Bootstrap-specific. I encounter the same problem on http://output.jsbin.com/xumeja/1 , where Bootstrap has been disabled, on my iPhone 5S running iOS 8.4.
Jesus that's a gnarly bug.