There is only one Holy pindi (natural rock formation) in the form of three pindis representing three goddesses Kaali, Lakshmi and Saraswati.
From the official website of Mata Vaishnodevi Shrine board,
It is reiterated that Darshans inside the Holy Cave are in the form of natural rock formations called Pindies. There are no statues, pictures or idols inside. All along the track and at the Bhawan, there are many photographs explaining the nature of Darshans inside the Holy Cave. Yatries should observe these carefully since these are meant to guide them towards the final Darshans in the Holy Cave.
The above paragraph is given in bold in the website.
But there are other darshanas inside the holy cave. From the other page of the same website,
The Holy Cave is around 98 feet long. Besides the main Darshans of the Pindies inside the Cave, there are various other Darshans, outside and inside the Holy Cave and around the Holy Pindies.
It is also stated that the original holy cave will be closed during peak seasons and new tunnels are used when there is rush.
Yatris may however note that most of these Darshans are possible only if the original cave is used. However, owing to the heavy rush, usually the new tunnels are used and the original cave is opened only during the lean seasons. Yatries desirous of having all the Darshans are advised to formulate their programme to correspond with the lean seasons.
So, it is possible that your friends have gone through the tunnels which you didn't go.