When you open the backlog, there's a small counter for pagination (bottom right of this screenshot).
When selecting the "re-open" filter in the top, the first number (amount shown on current page) turns into a "NaN":
The same happens when filtering on "auto-deleting":
In my case, there were no entries markes as "re-open" or "auto-deleting", so this is likely to happen on any filter that has no entries to hide.
When you open the backlog, there's a small counter for pagination (bottom right of this screenshot).
When selecting the "re-open" filter in the top, the first number (amount shown on current page) turns into a "NaN":
The same happens when filtering on "auto-deleting":
In my case, there were no entries markes as "re-open" or "auto-deleting", so this is likely to happen on any filter that has no entries to hide.