Why do i keep getting messages from eBay about "Suspicious" bidding on item that i have sold ?.

[pchr37]

I keep getting eBay messages about " Suspicious "  bids on items that i have sold. 

What can be triggering their stupid Robots to do this ?. 

[twyngwyn]

Maybe the underbidder on your syringes got stroppy?? 

That’s the only item with more than 2 bids