Invite code display order changes on re-load
Pressing the 'Generate new code' button inserts a new invite at the end of the list on the page.
However unused invite codes appear to be listed in chronological order. This means re-loading the page flips any freshly created invites to the top of the list.
This makes it a little harder to track who you've given which invite without checking the invite code.
I think the best fix is probably to put the list of invites below the button and have new invites generated at the top. Flipping the list of active invites so they're oldest at the top seems less intuitive.