Short answer: there is not enough data yet. The page works. It declines to calculate a rate it cannot calculate honestly.
The rule
In Cloneable's own words:
On screen: "Rates need 20+ objects and 30 min on site, else "—""
So a dash does not mean zero and it does not mean broken. It means this fielder has not yet done enough in the window you look at for a rate to mean anything.
A crew that captured three poles and left has no meaningful hourly rate. Showing them a number would be worse than showing them a dash.
Why it looks like a fault
The threshold is real, sensible, and written down in a panel that is closed by default.
Open the panel about how Cloneable works out the figures and it is all there. That panel is also the best explanation of these metrics that exists, so it is worth reading once even when your numbers are fine.
What to do
Nothing, usually. Come back once crews have done a real stint.
If you see dashes where you expected numbers, check the date window you look at. A crew that has done a full stint and a crew that dropped in for twenty minutes will show a number and a dash side by side, and that is correct.
Two things to know before you read too much into the numbers
A working day here is first capture to last capture. Not a shift, not a timesheet. So the percentages are shares of the window a fielder actually captured in, which might be four hours. That makes them useful for comparing shape, and misleading if you read them as a portion of somebody's day.
Time on a single pole is a floor, not a measurement. When the app saves everything about an object in one go, which happens on roughly a fifth of them, the recorded time comes out as twenty seconds regardless of how long it really took. So treat the per-pole time as the shortest it could have been.
More on what each number means
The panel on the page itself, about how Cloneable works out the figures, is fuller still, and it is worth opening once.