The objective is zero while model is solved with non-zero values

[Betristor]

When using gurobi to solve a model, the log in console shows that the objective is zero while the model is solved with non-zero values.
The log of gurobi is as follows:

Optimize a model with 8938 rows, 5068 columns and 26021 nonzeros
Model fingerprint: 0x3e181d3b
Coefficient statistics:
  Matrix range     [2e-05, 1e+01]
  Objective range  [0e+00, 0e+00]
  Bounds range     [0e+00, 0e+00]
  RHS range        [3e+00, 1e+04]
Presolve time: 0.00s
Presolved: 5040 rows, 2463 columns, 13881 nonzeros

Ordering time: 0.00s

Barrier statistics:
 Dense cols : 6
 AA' NZ     : 2.050e+04
 Factor NZ  : 8.022e+04 (roughly 4 MB of memory)
 Factor Ops : 1.744e+06 (less than 1 second per iteration)
 Threads    : 8

                  Objective                Residual
Iter       Primal          Dual         Primal    Dual     Compl     Time
   0   0.00000000e+00 -5.37889250e+04  4.14e+02 0.00e+00  4.99e+01     0s
   1   0.00000000e+00 -1.83853479e+04  4.52e-02 1.46e-02  7.59e+00     0s
   2   0.00000000e+00 -2.15364328e+01  3.41e-13 6.06e-07  3.15e-03     0s
   3   0.00000000e+00 -2.27813207e-04  5.85e-12 6.41e-12  3.33e-08     0s
   4   0.00000000e+00 -2.28789615e-07  3.41e-13 6.72e-15  3.33e-11     0s
   5   0.00000000e+00 -2.28965442e-10  2.27e-13 6.68e-18  3.33e-14     0s

Barrier solved model in 5 iterations and 0.02 seconds (0.02 work units)
Optimal objective 0.00000000e+00

Crossover log...

       0 DPushes remaining with DInf 0.0000000e+00                 0s

    1754 PPushes remaining with PInf 0.0000000e+00                 0s
       0 PPushes remaining with PInf 3.1185624e+04                 0s

  Push phase complete: Pinf 3.1185624e+04, Dinf 0.0000000e+00      0s

Iteration    Objective       Primal Inf.    Dual Inf.      Time
    1757    0.0000000e+00   9.906208e+04   0.000000e+00      0s
    1761    0.0000000e+00   0.000000e+00   0.000000e+00      0s

Solved in 1761 iterations and 0.03 seconds (0.02 work units)
Optimal objective  0.000000000e+00

[jd-foster]

Your objective function is most likely the 0 constant function. You can see that the objective function never changes from 0 under the "Primal" column.

This is not really an issue for the Gurobi.jl Julia interface; it's a model or solver question.
I see you've also used Discourse already (https://discourse.julialang.org/t/construct-a-jump-model-from-smaller-models/91929) to ask something similar. That's the best place for this type of question.

[Betristor]

Thanks for answering.