GA with constraints not running simulation for first 4 generations

I'm using a GA to run some simulations and optimize parameters. I have a few constraints between parameters (or else the simulation may not run). With the constraints in place, the GA immediately jumps to the fifth generation before running the simulation. The simulations take a few minutes, so it's obvious it hasn't run until the 5th generation, at which everything behaves as expected. Screenshot below (I stopped it prematurely at 13 generations).

A = [1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0;...

0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0;...

0 0 0 0 0 0 0 0 0 0 0 0 0 0 -1 0 1];

b = [4; 3; 0];

% Set Options for Optimization

options = gaoptimset('CrossoverFrac',0.5,'PopulationSize',20,...

'StallGen',12,'Generations',40,...

'PlotFcns',@gaplotbestf,'OutputFcn',@myoutputfcn);%More options can be assigned %was pop size 15, generations 25 stallgen 5

[xOpt,fVal,exitflag,output,population,scores] = ga(@(x)objective(x, Wx1, Wx2, Wz1, Wz2, LFx, LFz, LFd, LFh, RFx, RFz, RFd, RFh, OHx, OHz, OHd, OHw, OHgap),...

17,A,b,[],[],lb,ub,[],intCon,options);