Ebay auto accepted a best offer - I never had the box checked to do that

[frudoodette]

I just had something weird happen.   (or did I screw up?)

I listed an auction with a best offer option. 

The last time I had this done, The offer was sent to me to accept or reject it (or ignored it). 
I never checked the box to auto accept offers at a certain price.

This was the email I received at 10:53PM. 

You’ve received an offer for ....... Hurry, this offer will expire when your listing ends: Sep-23 19:53:50 PDT.
The offer was for $5.00 
The original auction listing price was $8.00

I never accepted the offer as I was asleep. 

Then this is the next email I received:

Great news, your item sold. We’ll tell you when the buyer pays
The buyer hasn’t paid yet, so hold onto the item until you receive payment. We’ll send your buyer a reminder within 48 hours.

Sale Price: $5.00

How did this happen if I never accepted the offer?  

Thanks. 

[frudoodette]

This is the auction. 
My auction page states the winning bid is $8

However the invoice that ebay auto sent is $5 

https://www.ebay.com/itm/263952854744?ssPageName=STRK:MESOX:IT&_trksid=p3984.m1559.l2649  

Would ebay have to check this to see if I did an auto accept? I know I didn't. 

[annasunicorns]

I would contact customer service during us business hours, pointing out the discrepancy.

[missjen831]

You didn’t accept an offer. It was an auction that ended with 1 $8 bid. Are you sure eBay sent a $5 invoice?