You weren’t innocent, and I didn’t patronize anyone. You broke the draft rules by having an invalid hero selection when your timer reached 0.
Preselecting a hero does not guarantee you get that hero. Only locking a hero does.
Cho’Gall is not a valid draft selection once someone on your round picks anything else than Cho and Gall.
Even if it’s at the very last second.
There is no “issue” or bug. See the Blizzard response on this topic below (a topic that gets repeated almost weekly):