You added a new disk to the source VM, which made the replication pause.

When you add a new disk to the source VM, the replication pauses.

vSphere Replication detects the addition of a disk to a VM and generates an event such as vSphere Replication handled a disk addition on a virtual machine.

Include or exclude the new disk in the replication.

You can set up and view an alarm for the event by using the vSphere Web Client. See the vSphere Administration with the vSphere Client documentation for details.