Shopping cart Shipping total do not add up ???

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Shopping cart Shipping total do not add up ???

I am using Version 1.3.0.10 - 0.114s so I do not know if this has been corrected or not. Or whether it is me.

If I add an item the shipping charge is £2.50, if I add an identical item the shipping charge jumps up to £23.50

But when the order is completed the shipping charges on the invoice are shown correctly as £4.00

Any ideas ?

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Problem sorted.

It was my fault, I had set up shipping weights as being 0kg to 0.1kg = £2.50 and the next one as 0.101kg to 0.2kg = £2.75 etc etc up to max of £23.50

It seems Prestashop cannot then recognize products weighing 0.1kg and it just defaults to max.

To my thinking it does not seem logical having 0kg to 0.1kg = £2.50 and the next one as 0.1kg to 0.2kg = £2.75 etc etc.

But thats the way it seems.