I had two interviews and received a rejection after the second one. I'm not sure why it happened.

The sequence of events was as follows:

1. A quick Q&A about my past work.
2. A technical interview began, but the coding platform was not functioning well (my cursor was jumping all over the screen as I typed). We moved over to HackerRank, where the interviewer copied the question into the middle of my console. I asked if it was okay to copy the question elsewhere as it was distracting, and he responded yes. I copied it to a notepad.
3. I solved the question within the allotted time, and it worked for all cases.
4. We spoke for 10 minutes afterward. When it was time to conclude, he ended the call abruptly (as if he needed to leave immediately).

I'm still confused about what happened. If I had been told my solution was poor, I would have been fine with that, but there was no feedback at all.

Past projects?

Why this role?