IP address has been keep changing when i start my VPN

Hello everybody .
I am using pritunl VPN and whenever i try to connect with my VPN my IP address is keep changing . I need to fix it . any solution appriciated.
Thanks in advance.

The virtual network IP address should remain the same if multiple devices is disabled in the server settings. If the virtual network is not large enough to assign an IP address to all users random IP addresses will be used. If an issue occurs with the IP address database running sudo pritunl repair-database will reassign the addresses.