Range problem with Grid

I've been using Grid/Clique to heal on my priest for years, but suddenly I have started having an issue that I can't seem to figure out. It seems that the range checker has stopped being accurate, so that when I go to heal a person who appears to be in range in an instance(not faded out), they are in fact out of range. It's only off by a small amount, if they go very far away then it is still working. I've checked the range options and they seem to be set right, but there must ...

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