Damn, that really sucks I’d be freaking out too if that happened during a big sale.
You're not alone though there have been rare cases where Steam auto-refunds purchases due to payment issues, like:

A chargeback/dispute from your bank or payment provider

An issue with your card or PayPal (like it being flagged or canceled)

A failed transaction that looked successful at first


Here’s what you can do:

1. Go to Steam Support → click on “Purchases” → then select one of the refunded games.
You should see the reason it was refunded if it says anything like "payment reversed" or "chargeback," then that’s the issue.


2. If you’re still not sure why, submit a support ticket and explain everything clearly tell them it wasn’t intentional and you want to re-buy the games without losing the original sale price.


3. Ask them if they can restore the purchase or honor the sale price since it was Steam’s system or a payment issue they’ve helped some users with this before.



Also double-check your email and bank/PayPal history sometimes the refund reason is there too.

I really hope they sort it out for you, bro that’s the worst feeling during a sale.