Since you are trying to loot someone else's kill (which is technically ninja looting, unless you have permission), they likely killed it while you were in another part of the zone. Your client isn't updated with the exact kill location the server recorded since you weren't there at the time, so you see the body at the location your client has instead.
If you zone/camp and come back, then you will see that the body updates on your client to the location the server recorded as the location of death.
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