How can i identify "deceptive content" on my page?

I am a web developer maintaining an online shop here The website does not use a CMS, it's custom made, and i have complete control over the code. Recently my client added a new category in the shop, and a few hours later, google reported that page as a "Deceptive site". All the other categories seem to be fine, and the website uses a template page to display items, so, code-wise, there is no diference between any two categories. I've tried using google's search console, but i was still unable to identify the so-called "deceptive content".

So my question is: what exactly is considered to be "deceptive content" and how can i identify it in my website?

Any help would be much appreciated. Thanks