One Tesco shopper has spotted a self-service glitch that resulted in her bill coming to minus £150.
The anonymous customer posted on a Facebook Group named Extreme Couponing and Bargains to explain how it appeared that discount were randomly added to items.
Birmingham Live reported that this Tesco shopper ended up with a total of -£150.75 on just seven items.
The customer claims that they were able to check out despite this clearly inaccurate sum.
They said: “I didn’t think it would work - I was sure it would autocorrect at checkout. Massive glitch on self serve."
Have you seen this Tesco glitch? Let us know: mirror.money.saving@mirror.co.uk
The supermarket has installed self checkouts at most of its stores over the years and they are usually an easy way to get your shopping out the doors quickly.
Others have had similar experiences but say the calculation corrected itself.
As this is clearly a glitch, Tesco would be within its rights to decline the sale.
Mark Gibson said: "This happened to me on a shop.
"Got over £500 worth in the trolley but came up at just under £100, corrected at self scan and I asked why but they had no idea as to why it was scanning that way.
"They scanned everything again on a different scanner and it still came up cheap but they said they couldn't let me have it. So I just said I no longer wanted it."
Claire Louise said: "I had this with reduced Easter eggs I was like 200 in credit so then done a 200 shop so I’d pay nothing...
"Got to the till it corrected itself and my shop was stupidly expensive! [sic]"
Kimberly Louise also commented: "This happened to me a few months back and it did correct itself when I got to the till unfortunately."
A Tesco spokesperson said: "This relates to a small system glitch that happened around ten months ago and impacted a very small number of products.
"It was corrected at checkout so did not result in shopping being charged incorrectly and was fully resolved at the time."
In more supermarket news, Tesco has quietly reduced the size of its ready meals - all while upping the price of some products.
It's another example of " shrinkflation " which is where products reduce in size but stay the same price - or get more expensive.
Data from researchers at Assosia show how the size of ready meals across the board have changed at the supermarket.
Tesco has reduced its Sweet Potato Red Thai Curry and Jasmine Rice from 450g to 400g - but the price has risen from £2.75 to £2.80.
Meanwhile its Cottage Pie used to be 800g but is now 750g, with this one retaining the same price of £3.50.
