Scroll bar problem

Great Plugin. Just what I needed.

One problem. When you have enough text to create a scrollbar, the scrollbar isn’t in its proper place:
http://i.imgur.com/KZlDpoh.png

If you close it and open it again, it does. But first time it always does that.

https://ww.wp.xz.cn/plugins/wpbizplugins-custom-admin-help-boxes/