Hi @Savior, sorry for the late reply. When you posted the comment a couple of days, I was offline for the rest of the day, so wasn’t able to check. Looking at the rest of your comments, it looks like the portal has now shut. You can still post the coordinates if you like.
For anyone else who has the original issue, are you able to provide coordinates and the worlds as well?
Schrödinger’s portal. Stays in a vague state where its open and closed until you observe it - it then opens or shuts down. #BoundlessScience.
I had a similar issue with my portal. I knew it was out of fuel so I added more. I went through it just fine but when I tried to go back through the other direction, it closed on me. I had to go back home through the sanctuary. I went to check the portal and it was closed but still had the fuel I just added in it. I had to spend the 50 oort to open it back up.
Location is 2134 -916. 73