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Can't duplicate class when I get to 6 copies

I am using a template by Byra and under Portfolio there are 5 items in the template. I need 9 so I just duplicated the menu items and scroll over animation but when I get to 6 copies of the “Background Images” that animate on scroll over - I can’t duplicate the class anymore. I can duplicate Images 1-5 but not 6. And when I do this is screws up all of the scroll over functions. Any ideas would much be appreciated!

This is my version of the site: Byrå Design - Webflow HTML Website Template

Thank you!