The National Lottery has apologised to customers after a "isolated issues" were reported with playslips.
Some punters have received incorrect numbers on their tickets when using playslips in shops due to a technically fault.
In a statement, the National Lottery said "specifically, a small number of cases have occurred where numbers which are manually selected have not been included on a ticket, when selected together with Quick Pick numbers.
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They continued: "In a small number of such cases the manual selection may not have been entered into the relevant draw and customers have not been charged for that line."
They told customers that this issue is only affecting sing playslips to purchase Mixed Play tickets in shops only and online play is unaffected.
The National Lottery said their technical teams "continue to work to identity and rectify the issue" and players should ask shop staff "if they encounter any difficulty".
They reminded players to "always check their tickets to ensure that it is correct at the time of purchase."
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