Program members imported via bulk import program member API call is not showing in Marketo

Hi,

I have a test program created in the year 2018.

Today Imported program members via bulk API with program member status as "Member"  and set program member values.

API returns status "Queued" and import completed without errors

I do not see any program member when I clicked on program "Members" tab in Marketo UI.

ironically, I saw all emails when I exported program members data.

Program type is default, channel is email

I can see program members in Marketo UI if I import emails via .csv file manually.

Can you please help me to understand what's going wrong

Thanks,

Babu