Probelm accessing RooArgSet from RooDataSet in Root 5.26


I have Root (v5.26.00b) installed on my laptop which runs RooFit v3.12 and I noticed something strange:
If for a RooDataSet if I want to extract the information for a particluar row, using the get(index) function, the row and the corresponding RooArgSet returned is always the last one in the RooDataSet.

However, I tested this on lxplus5 and there it returns the correct values.

Is this a problem with my installation?

Best regards,