Out of Stock Penalty on R atin g?

Greetings all FBA Gurus, Hope you’re doing well.

Can you please answer my query and confusion:

My listing had a total of four (4) five-star r atin gs with two (2) responses.

It’s been nearly two months now that product is out of stock but I have noticed that the overall r atin g of five dropped to 2.4 and the breakdown of r atin g doesn’t even match in terms of percentages.

Just want to confirm am I getting penalized by Amazon FBA in terms of drop in r ating s?

Thank you.