Maybe nothing is wrong. Some of the rare acans are very sensitive to light and changes thus causing them a week or more to acclimate. I have had some that will stay closed for up to two weeks after I move them.

Be patient and I'm sure they will open up.

Now....the above could be true but there is a whole list of things that could be setting them up for death but without details there isn't much more I can tell you.

How long have you had them?