It was found in the topic:
viewtopic.php?t=1132
I've tested the potential bug an found using example esfit function with some modifications:
FitOpt.Method = 'genetic int';
FitOpt.EliteCount =10;
FitOpt.PopulationSize = 50;
FitOpt.maxGenerations = 50000;
No-GUI mode gives expected log:
Running optimization algorithm with 2 active parameters...
2 parameters
population 50, elite 10
50000 generations
But for GUI mode the log is other:
Running optimization algorithm with 2 active parameters...
2 parameters
population 20, elite 2
10000 generations
Terminated: Stopped by user.
Skipping uncertainty quantification as requested.