ZeroTier VPN network, with IP addresses unknown and anonymous location

Hi,
Within my zerotier VPN network, some duplicate IP addresses appear, where one of the duplicates start with ( : : ) , see red arrows.
If I try to identify the destination I get “Unknown Location” (Multiple Locations).
Another IP address with the same unknown destination are :

  • 0.0.0.1
  • 0.0.152.147

QUESTION 1. Because the IPs are duplicated,
QUESTION 2. …and because one of them has “::” at the beginning.
QUESTION 3. …and because they point to an unknown and anonymous location ?
QUESTION 4. …is this normal ?

QUESTION 5. ¿ If I am in a Zerotier VPN network, can any user extract file from my computer ?

Regads