when items are added to the cart .the cart and shipping estimator it is adding 3lb to each item

example

Estimate Shipping Costs
Total Items: 1 Weight: .05lbs Amount: £33.00

Available Shipping Methods Rates
Flat Rate (Best Way) £5.00
Per Unit (Best Way) £3.00
Table Rate (1 x 3.05lbs) (Best Way) £8.50

the item weight in this example has been set to 0.05 but table rate shows it as 3.05

any ideas how to sort this out