see screenshot:

These misleading calculations happen when the item has additional information like the x2 below, so ALL calculations need checked.

Aldi The Fishmonger The Fishmonger Hot Smoked Salmon Fillets
ALDI
£3.99
£1.08 per 100g is MISLEADING

Incorrect price per 100g calculation, as calculation
FURTHER DIVIDES
bv 2slices !!! price SHOULD be £2.16 per 100g