Question with two solutions

Not sure if this is an anomaly in the site fuction, but the following question got two comments marked as [x] Solution.
I remember (not sure now) to have marked as Solution a comment or answer and this action dis-marked the previously marked one.

EDIT: Apparently both done by the same user:

I noticed this and I was surprised. This was not possible with AskBot.

But, here, we have only Comments and no Answer. Perhaps this matters. I have no idea about Discourse configuration and capabilities.

Yes, I thought the thread was coming to an end before Leroy posted so decided to mark as solved even though it wasn’t! Sorry if that caused a mixup, but Leroy’s post actually was a proper solution. So after he posted I marked his post as the solution. I noticed an inconsistency too, about 2 checks at once.