Hi Rui,
I tried to clear my browser’s history but it didn’t help me. Finally I found the solution.
On desktop in Internet Explorer 11 and in the mobile Chrome worked well the portfolio item site, but on desktop in the Chrome ver. 56.0.2924.87 (64-bit) I saw the small rectangle.
I started to analyze the sf-portfolio-detail.php and I found in this file a BS character with Notepad++. (Attached picture) After I deleted this character and copied over the original with the modified, the rectangle disappeared. 🙂
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