A sub-presentation, opened in CRM iRep, shows the first slide instead of the associated slide that references the sub-presentation in Vault.
The selected slide does not display first in iRep if there is a sub-presentation referenced in that slide in Vault.
The first slide of the referenced sub-presentation displays before the slide that is chosen to be added to My Presentations in iRep. This is designed to ensure that the required information is shown in iRep when the sub-presentation is accessed.
Vault CLM Integration Documentation: How to Use Relationships for CLM Content