How to update output saved in DB in a new process as input which is a array

I have contact recordtype and experience record type with 1 contact to multiple experiences, linked through = experience.contactId.
I have a form which saves contact details and a editable grid to capture multiple experiences. When I save I run a process model to first write to the contact DB and then I am writing in experience data entity.

In the wirte to DSE for experience, I have mapped the input of data note in second process with generated automatically from DB in contact table.
This works fine with 1 experience entry, but if I add 2 entries then the process error out as for 2nd experience entry the contatId is null and due to which unable to write the data in experience table.

Can someone help?

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