Check the following:
Ethernet --> Mod Config --> WAN options
Make sure that you have as many IPs in your pool(s) as you have
Go into your Max and change the following setting:
Ethernet --> Mod Config --> Auth
Auth Pool =
Change it to "No"
You will have to reset the Max after this or you'll never free up the IPs.
After setting and saving the above option:
Hit ^d then d (diagnostics)
nvr (this resets the max)