Maintenance for the week of November 4:
• [COMPLETE] ESO Store and Account System for maintenance – November 6, 9:00AM EST (14:00 UTC) - 6:00PM EST (23:00 UTC)
Only the first 3 dungeons are VR5. The second set are all VR10.
And although the first 3 dungeons are technically all VR5, they are clearly different levels of difficulty. A group of VR2-3 can easily clear BC and Spindleclutch, but they'd have issues on Fungal Grotto.