Display Weight on Cart Page doesn't work

[smallfish]

Display Weight on Cart Page doesn't work
see the attached pictures, can't find any weight there. Please fix it.
Thank you!

[abolabo]

hmm..what about heading title of main block on cart page?

[smallfish]

Sorry! I find out my problem right now. My "product_option_values" weight unit is inconsistency with the "products".
So that the system can't calculate the weight correctly.
There is no bug.