Not able to programatically delete Custom Resources

I am trying to delete some existing Custom Resource records using Apex. Here the custom Resource is called AcField.

The fragment of code:

-------

//blowing off all existing custom resources

Map<string,AcField__C> cfCurrMap = AcField__C.getAll(); //get all existing records

Set<string> existingCRs = cfCurrMap.keySet();

List<AcField__C> existingL = new List<AcField__C>();

for (string ex: existingCRs) { //add to list to delete

existingL.add(cfCurrMap.get(ex));

}

//delete any

if (existingL.size() > 0) {

delete existingL;

}

---------

The resulting behavior is inconsistent. Some times a subset of records get deleted, sometimes no records get deleted.

Could some one point out what the issue is?

Thanks.

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