When I had entered Astryl's tranquility, I had taken two steps on the path, then I had encountered something like a crate. There was no image. I clicked "Interact". Nothing happened except the buttons flashing. I tried to click "Ignore" a few times, with the same outcome. I left and came back.The thing wasn't there.

Instead, there was an Aurleon I could battle. I was dragged in, and my main sylesti, Sylvia already had "Bleeding" or "Hemorraging" (Or something). I didn't use a turn. What was up with that?

In the future, you should take a look at the battle log for clarity. It will tell you what you've encountered. As for why there was no image, your computer was having problems downloading the image. This could be for a few reasons, but nothing really important. Just a bit of lag on the server, your internet, or Cloudflare.

As for the battle, I really can't say. There's not enough details and I have no way of looking into the database for answers.

If this happens multiple times, try figuring out what causes it and let me know the steps to repeat it - then I can investigate and see what's happening.