Touch and Go Clones

Ok so I took 3 6 inch clones, one from each of the 3 different mothers. I cut with a razor, cut slits, used powder, and into the soil they went, 6 inch pots too. They all have humidity domes. Theyf have been strong since they perked up on day 2. A day or two later, I watered them all. The 2 seemed to like it, but one didn't. So here is the question.

Why would a clone, after being about 3-4 days old and otherwise very healthy, suddenly droop down miserably after the first watering? Is there such a thing as watering shock? Like the first watering? I can't figure it out.
 
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