Not all that unusual, really.
Check out the final resting places of famous people. Mozart was dumped in a pauper's grave, and the cemetery has a marker, but his grave is not known for sure. Da Vinci's body was dis-interred and his bones mixed up with other people's. The grave of Jacob Waltz, the famous Dutchman who lost his mine in the Superstition Mountains was lost when his grave was flooded and his marker floated to the far end of the cemetery.
There's even a story of an Amierikan woman vacationing in Moscow whose body was mixed up with a Russian general and accidently buried in the Kremlin. The General's body was shipped to the USA in her place.
Stuff happens even after you die ......
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I wake to sleep, and take my waking slow. I feel my fate in what I cannot fear. I learn by going where I have to go. ~Theodore Roethke