Zoho Recruit - Offer letter - empty "Sent on" field

Zoho Recruit - Offer letter - empty "Sent on" field

Hi,
In our offer letter, we use the "Sent on" merge field. We noticed that this field remain empty on the first version of the offer letter.
Only when we revise it, the field get populated with the correct date.
What are we missing? Any setting to be made?
The "Created at"/"Modified at" fields are date-time and we want just the date.
Thanks