Hi @Sarah_Edgeworth ,
It’s possible that your shipping rates are not in compliance with Google’s terms & conditions. Google states that shipping rates on Merchant Center must match shipping rates on your store site. If they don’t, rates on Google must be higher.
The theory is that if a customer sees a shipping cost on a Merchant Center listing, then comes to your store to check out, only to find rates are higher, Google looks like the ‘bad guy’ for misleading them. Whereas, if they’re cool with the shipping cost on Merchant Center and it turns out to be lower on your site, the customer benefits.
We generally recommend to merchants using our app to contact Merchant Center directly and ask them for instructions on how to inflate shipping prices on MC to bring them into compliance.
This may not solve the issue you’re having, but it might be worth looking into as a possible root cause.
Best regards,
Ron