On Friday 12th of November 2021, Google was bidding 2 to 3 times higher on shopping ads.
The algorithm bug was resolved on the 13th Saturday, November 2021.
If you have encountered unusual high bids, contact Google Ads support to ask for a refund.
According to Ads Liason, Google will contact you with more details. The AdsLiason handle is the official Twitter handle for two employees that communicate with Google internally to outsiders. So the info provided is verified.
Update: Google Ads has now officially added the info in your Google Ads account.