System unchecking "is part of?" from a reference table

Today I faced an issue on a reference table where the system has automatically unchecked the “Is part of” checkbox of a reference table.

Every time I check and save the system unchecks it

Has everyone faced this issue? Any solution?

UPDATE:

There was another column checked as “is part of”

The system allows us to point only one column as “part of” a parent record

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