"top" value of autogenerated div (just above enscroll track3) increasing when page scrolled

[Akhoy]

Hi, thanks for the great plugin. While using it, I've noticed an issue. The top value of the div just above track3 is increasing when page is scrolled down. When this happens, the scrollbar moves up without sticking to the div and this doesn't look nice. Any tips to fix this? Your response will be greatly appreciated. Thanks.