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Auto Model: Performance is worse when auto feature selection / generation turned on?
I put the same data set in auto model and at first ran it with 'automatic feature selection / generation' turned off, then I ran it again with feature selection/generation turned on.
When 'automatic feature selection / generation' was turned on the performance of the model was worse than when it was off. I am a bit confused why adding feature selection / generation would potentially make a model worse, if there aren't any features that improve the performance of the model would they not just be rejected and the original model would come out, so the performance should only be the same or better?
Again I am very new to this and am just a bit confused here, any help would be greatly appreciated!