Yes it is a general feature of the way the data is produced. In the current challenge we want to know how we can produce 2 jets and above. so at the end we don't evaluate the solution when jet are below 30 GeV. The KL divergence is calculated for the following bins :
That's seems about right. We are should see some events that are expected to fall beyond the detection phase-space. I think it is safe to consider neglecting these events at the moment. For instance you can required to have n_jets >= 1 so you can have at least one object in the final state.
The data is structured as follow, if no jet is found then then this means both jets are below 30 GeV threshold and this event can be discarded. It is possible to have this special case.
So you can basically make a selection to choose the right events to work with. For example, can do: