As you are creating a question, it is advisable to regenerate the question multiple times. This has two benefits.
|•||Regenerating will quickly highlight any issues with questions which are not consistently difficult. This is particularly the case if you have created fully worked solutions.|
|•||Regeneration will also highlight any numbers you should have parametized but have forgotten. Those numbers will remain static when they should have changed.|
Regenerate, regenerate, regenerate.