Hello,
when I go to the Backlog I can see that there are 47 issues (stories, tasks, subtasks) in the backlog.

But when I go to the issue search and query for issues with the Status = Backlog, then I can see 83 issues

After digging deeper I have the assumption that some subtasks are not shown in the backlog and some are shown. I can confirm that the backlog is not filtert anyhow and subtasks are generally visible in the backlog.
This is really bugging us, since we want to have an overview of all the open work in backlog.