When it comes to supermarkets, you usually have two payment options.
You have the regular checkout with a person sitting behind the till, scanning through your items.
And then you have the self-checkout, where you do all the swiping and scanning yourself.
Both approaches have their positives, and people usually just go with their personal preferences while doing their shopping.
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But some Aldi shoppers have put out a warning about why people should exercise caution at the store's self-checkouts.
If there's one thing Aldi is known for, it's their competitive prices.
However, some fans have alleged that promotions aren't added to purchases automatically on the machines.
Instead, these seemingly need to be added on by a member of staff.
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As a result, people who use self-checkout machines may be missing out on the best bargains.
In a Facebook group for Aldi fans, one user wrote: "Any discounts don’t automatically apply on the self-checkouts. You have to ask a human employee to take the discounts off manually.
"This applies for % off stickers and any multibuys etc. I don’t know if this is common knowledge."
Going off the reactions of the other group members, this was an issue they were all too familiar with.
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One wrote: "Staff have to apply the discount on a normal till so def will have to on a self-service till.
"I’ve had a few missed then realised!"
Others insisted that Aldi should put up signs to inform customers about this issue, with one even branding it 'disgusting'.
When approached for comment, Aldi told The Mirror that employees do need to manually input discounts at the self-checkout tills.
However, they said that feedback on the self-checkouts had been 'overwhelmingly positive'.
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The spokesperson also urged anyone who believed they'd been wrongly charged to get in touch with customer services.
This isn't the first time that Aldi's checkouts have come under scrutiny.
The supermarket's till workers have long been noted for being very fast with scanning.
So fast, in fact, that shoppers were coming up with ways to keep up.
Some Aldi shoppers have gone to extraordinary lengths to try and slow the staff down, with some even resorting to scrunching up the labels on certain items so that the workers cannot scan them.
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That seems a little petty, in my opinion.
Somebody else merely staggered their items on the conveyor belt so the worker couldn't speed through with as much ease.
Who knew shopping could be so complicated, eh?
LADBible have reached out to Aldi for comment.
Ben Thompson