If your ISP does not provide IPv6 service, then certainly disable those settings. But if your ISP provides an IPv6 connection, enabling that in pfSense is fine. However, if you are not skilled in the networking art, it may be better to not attempt to configure IPv6 because it seems each ISP has their own unique "quirks" in their implemention of that protocol.
The other thing I notice in your logs is that you seem to have the "Block Private Networks" setting enabled under INTERFACES > WAN. Your default gateway looks to be in RFC 1918 space (192.168.0.1), so you definitely would want to uncheck that option as shown below:
BlockPrivateNetworks.png