Issues Adding Leads to Smartlead Campaign via Clay: Need Insights

whenever i seem to add leads to smartlead campaign via clay natively, it seems to respond "Could not ad lead" to an unusual amount of leads. whenever i import csv manually into clay, i always get way higher conversion. why is this happening? here's the table: https://app.clay.com/workspaces/156719/tables/t_aM48XAw8JwEi/views/gv_QUD5buzEzPfX