UFW reload and disable/enable work but not just enable

I have a test linode server (Ubuntu 17.10) for playing around. If the server is rebooted I need to either run

sudo ufw disable
sudo ufw enable 

or

sudo ufw reload

to be able to see the web pages on that server.

If I just run:

sudo ufw enable

I cannot see the web pages from a remote computer.

I'm also curious why I have to do anything with ufw after a reboot as the rules are there. Why do they need a kick start.

Thanks!

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