system message telling the subproject is already inserted to another master project, although false

Copper Contributor
I have an issue in Project Online:
For each change and save of a subproject under a master project, I get a system message telling me that the subproject is already inserted to another master project, although this is definitely not true.
To further analyze this issue, I selected 2 new projects and place one of them as a subproject under the another and got the same message - so it seems like an issue in the environment and not referred to a specific project. 
This is happening from the moment we did a recovery / restore to the environment.
Although these messages are annoying - no problem to save and publish.
Will appreciate your helpPicture1.jpgPicture2.jpg
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