slider to scroll down does not stay at same position when switching among tabs

I am using Mendeley Desktop 1.9.1 on Mac. When I move betweens tabs (open PDFs) in Mendeley or between the Mendeley windows and other windows (web browser, etc), the slider to scroll down in the tab where the pdf is open does not stay at the same position. The slider always goes to around 2/3 of the document. Especially for long documents, it is quite annoying not to be able to go back to the same page... So for example, I have a tab1 with a pdf1 open and a tab1 with pdf2. If I go to tab1, and put the slider to a specific position, go to tab2, move the slider to a specific position, and come back to tab1, the slider will be at 2/3 of the document, not at the position where I left it. Would it be possible to fix that for the next update ?