Empty space in windows taskbar

Hi there, I was looking for a useful reference manager software and I tried Zotero and I like it a lot, but everytime I open the software this generates a "blank" space at the end of my taskbar on my PC.

example: http://prntscr.com/s89kl4

How can I solve this? Because I really want to use this software, is easy to use and manage.
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