Board Game Arena

So I'm currently playing this game: https://boardgamearena.com/tableview?table=939959663

One of the objectives is for 3 visitors on the same level.

However, I noticed that the blue player was awarded this objective after placing only their second tile. I figured maybe I'd missed some special action, but I was confused by it.

Then on my last turn (placing my 4th tile), I placed a third visitor, but not in the same row as my first two, and was also awarded the objective. I think this is this bug: https://boardgamearena.com/bug?id=213125, but it also made me wonder again about how the blue player scored the royal objective with only two tiles in play. Can anyone explain that to me? If you are able to replay from Move #16 (just before they are awarded the objective), you can see this.

I think in the rules. If you are the 1st player that turn , you can complete a royal objective using 1 less resource. This may be what you are missing and hard to see after turns have been taken as to who was 1st that turn. Hope this helps