Derby opt in without player selecting it

Yes, one of our hoodies (who hardly ever plays) was "automatically" opted in for some reason after opening the app. (This was a couple weeks ago, not this latest derby).

This also happened to me, but only one time some year ago.

Later I read somewhere why this can happen. And I think this never happens "automatically".
Of course I am not sure if there is also a bug why this sometimes happens.
But I think most af the time it happens by opting in for the next derby without realizing it.

I don't have a screenshot at the moment and have never loaded up something here (it is a little bit difficult).
So at the moment I will try to explain how this can happen without a picture.

Do you all know how your derby stand looks like, when you click on it while you are opt out?
It has a text like "Are you ready to join the fun?....."
And on the bottom there is a button.
I checked the english version, it says: "Join next derby".
In my language it even says only "next derby".
Click on this button and you are opt in!

So I think, often when people open the derby to check what derby will come next, they then click on the button on the bottom instead of closing with the X.
And then they are opt in without realizing.

Can it be, that it happened like this?

It was not the case for us either. 

Thank you all for response.
Ok, was only an idea because I heard that that ways many players opt in without realizing.
And in my case it could be, that it happend like this.

Tahoe 🐾
Thanks. I read an instruction for screenshots from you and screenshooted it, if I will need it some day.
But for my post above I hadn't too much time and so I didn't search for my saved screenshot.

I tried it just right now in the weekly event post. And it worked fine. Thanks for helping.