Siblings not visible in group tree

I’ve created a family group, copied living person from my private tree, and invited my two sisters to join the group. When they go to the group tree they see themselves but not not their siblings. When they hit the siblings caret an error message pops up: “A relationship change was detected, refresh pedigree to get the latest changes.” But hitting the REFRESH PEDIGREE button in the error window does not help. What’s wrong?
Answers
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Have you created copies of the records for the siblings within the family group tree?
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I have not created copies of the siblings in the group tree within the group tree. I only copied them from my private tree. All siblings have different ID numbers in the group tree and private trees. My sisters only have themselves in their private trees.
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Today I had the same issue (error message i.s.o. siblings) in my private tree after changing the visibility of the memories of my sisters from public to private. But the issue was gone after a switch from my private tree to the group tree and back again.
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