Problem with a code not generated by Shopify

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Currents Gallery's Website has been working well for years. All of a sudden a slideshow that was created on the homepage through use of the editor stopped working properly. The slideshow is intermittently visible on the editor page and on the live page. I am not satisfied with the answers I get from the Shopify Theme specialist. Apparently he found the problem code, a screen print of which I've attached here, but says he can't delete or fix the code. I have to pay for that service. I have added apps through the Shopify store, but never make code changes myself. Currents is a small art gallery operated by 7 elderly women on a volunteer basis. We cannot afford more than what we are paying for this technology. Please help.