AHTUS: all ACT_* variables are ZERO except in 1930?

I downloaded all the 17 samples of AHTUS and those aggregated time usage variables such as “act_pcare” and “act_work.” But after I loaded it in STATA, only the 1930 sample has non-zero values for those act_* variables, all other year samples are all zeroes. Why?
Did I missed anything to include for sample 1965-2012 in AHTUS?

Thank you for bringing this to our attention–something is definitely not working as expected when we generate these variables. We are looking into the issue and will provide an update soon.