Either Review Aggregate Offer should be specified.

The google search console show that about 58 invalid content, which indicating that either review aggregate and offer should be specifided. This is from my e-com store. I have readed the solution on rank math. I did try to add review to my product page. after I finish it. The number of those invalid content has decrease. But a few day ago. It increse again. I don’t understand. I mean, those product page that I have added review, are now again showing invalid on goole search console. Why would this happen and how do I fix it? I have added reviews, it worked bofore but now it didn’t work. My website is ulipet.com. Would you guess check it for me? Thanks