filter of Used levels

Hello all ,
I am using the OpenBuildings Designer Conect 8 edition. I have a strange problem with the level filter, which define used levels in my file.
When I open a file, the filter works normally - I only see the levels in the list that are actually used. When I take any action, e.g. when I drag a model element, in LevelDisplay appears big list of levels defined as used that aren’t actually used in my file.
Maybe someone will comment on what I should do ..?
I have never encountered this problem before using AecoSim Designer.

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