Please don't tell me that I'm the only person who shops online and receives two and sometimes 3 when I only order one item? Anyone else?

This happens to me all the time and I am sick of it!! It must be a new scam because I only order one item of something and two or three are delivered!
It happened again today. I bought one pair of sandals and two of the exact same sandals were delivered.
Last week I tried to cancel a handbag that I ordered and not only would the outside seller for Wallymart not cancel my item but then he said that I ordered THREE and he wouldn't cancel any of them!!
I think that sellers are doing this to make more money!! It's a scam.
eBay, and Wallymart both are doing this.
Updates
7 mo
I found out how it happens. The company doesn't reset back to zero after it is purchased. It starts at 1, then you put your item in your cart, which equals 2 - or 3 if it starts out with 2 already in your cart. 🤬🤬🤬
Please don't tell me that I'm the only person who shops online and receives two and sometimes 3 when I only order one item? Anyone else?
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