Openmc.search_for_keff()stop without reach the target

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Hi everyone,I have a problem when I use the openmc.search_for_keff().I set the target with 1.03:

f,guess,keff = openmc.search_for_keff(model_build,initial_guess=0.0045,target=(1.03),tol=1e-3,print_iterations=True,run_args={'output': False})

but the search stop just run two rounds and k didn’t search the value I wanted

/usr/lib64/python3.11/site-packages/openmc/source.py:388: FutureWarning: This class is deprecated in favor of 'IndependentSource'
  warnings.warn("This class is deprecated in favor of 'IndependentSource'", FutureWarning)
Iteration: 1; Guess of 4.50e-03 produced a keff of 1.06339 +/- 0.00018
/usr/lib64/python3.11/site-packages/openmc/source.py:388: FutureWarning: This class is deprecated in favor of 'IndependentSource'
  warnings.warn("This class is deprecated in favor of 'IndependentSource'", FutureWarning)
Iteration: 2; Guess of 4.60e-03 produced a keff of 1.07082 +/- 0.00018

Could someone tell me how to fix this?