the text Simple Image Gallery Extended" popped up

Hi,

I'm adding images to a webpage. I placed 3 images in a row. The images on the first 3 rows are fine, but there is the problem on the 4th row - only 2 images in that row, the 3rd image dropped down to the 5th row(left). Between the 4th and 5th row the text "Simple Image Gallery Extended" popped up. What does it mean and what is the problem?

Thank you for your attention.

Kate

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