This issue is related with IE and it is stated very well in SIG PRO documentation:
It is important to understand that the "Polaroids" gallery layout makes extensive use of CSS3 which is not fully supported by all versions of Internet Explorer (IE). In order to make IE6 to IE8 compatible with this gallery we use additional JavaScript code which "triggers" behaviour in those browsers similar to CSS3's capabilities (e.g. thumbnail rotation, shadows etc.). Thus the layout is not 100% identical to modern browsers like Mozilla Firefox, Google Chrome, Apple Safari and Opera. IE9 however, being an actively developed browser by Microsoft (which supports some CSS3 specs), is known to have issues rendering this particular layout natively, which we're currently investigating. We strongly advise users whose site visitors are mostly coming from IE to possibly use a different gallery layout.
Try upgrading your IE.
JoomlaWorks Support Team
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