Product IDs not matching Merchant Center

I think that my product variations are causing a disconnect between the product IDs that the plugin picks up vs. the product IDs in Merchant Center. For example, on this page https://www.gcioutdoor.com/tailgate-chairs/pico-arm-chair-telescoping-directors-chair/ the plugin identifies the product id as woocommerce_gpf_505, which is not an id of any products in Merchant Center. In Merchant Center, the ids for each color variation of this product are woocommerce_gpf_525 and woocommerce_gpf_526. I tried disabling remarketing in Google Analytics, but that did not fix the problem. I also tried changing the product identifier from post_id to SKU but that only eliminated the product id from the plugin altogether. Please advise.