How can I correct a product weight error showing as 1g instead of 0.5g?

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Hey,

So I have one product with only 0.5 g (weight) but all the time it shows for 1g. Every other product the weight is over 1g and it shows correct but only for this one its 0.5g but shows 1 g

I already asked my theme developer and they said that it has something to do with this code snippet a member of the shopify community changed for me. But they wont help me cause its not handle stuff like this.