I have changed the website design now facing issue in Google Indexing

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Recently I have changed the website theme of my website LittleToes.com.

After my website is indexed my ranking is dropped and then I have reviewed the index page. 
I have seen that - Bamboo Diper collection page is indexed but it shows all product collection pages. It doesn't show the Bamboo diaper collection page in the Index. 

I have never seen this time of indexing issue in Google. How it has happened that - Google is indexing this - https://littletoes.com/collections/bamboo-diapers but actually Google is index shows this page - https://littletoes.com/collections/all

Check the screenshot I have attached below.


Please share you feedback if anyone have any idea about how to fix this. Thank you in Advance.