Pinned class jumping to top of container

[robputer]

First off - thank you for this awesome plugin!

I'm experiencing a bug though.

I am using the "containerSelector" parameter, and find that once I scroll to the beginning of the container, the pinned element (which is within the container, but lower down) suddenly moves up to the top of the container, and then becomes sticky onscroll.
It should wait to become "sticky" until the element has been scrolled to.

Not sure if this is just an unusual bug with my page setup? I also have a sticky navbar (using bootstrap), could it be interfering?

I tested using the latest version of Chrome and FF on OSX.

[mquestionable]

Same problem here