when solving a MIP using ConcurrentMIP (as well as some other non-default parameter settings, see linked log-file), Gurobi reports multiple weird things:
- The reported bound is greater than the incumbent.
- The log shows that for several iterations before termination, the best bound was already greater than the incumbent (yet this is a different bound than that reported at the end).
- The reported best objective does not match the one given in the log in the line "No other solutions better than ..."
- The solution in the log line "No other solutions better than ..." is clearly suboptimal.
The MPS file and log are here: https://rwth-aachen.sciebo.de/s/kGG6AqUeYAz2ZVv
I am running Gurobi 9.5.0 (upgrading to 9.5.2 is not easy because I am not in control of software updates on the machine), so I'm not 100% sure if this may be a bug fixed in one of the two releases since then.
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