Just me, or the system?

I'm experiencing problems searching for KNOWN profiles.
Example: Dezső Siedner is known to be on this tree of mine.
https://www.geni.com/family-tree/index/6000000189593994828
But when I search for Dezső Seidner I am told " No results found. Try changing your search criteria. "
Have I been singled out for this difficulty or are others experiencing it?
Roy