Strange error when importing excel (no corresponding member)

Very strange issue. I have a lot of identical entities (entity1, entity2, etc.) with the same attributes.  They are associated with the MainEntity as Many to Many. I use excel import to import records for all of them. But for some reason, only one of them doesn’t work. When I try to import it, it shows an error “The following error occurred when importing document: entity2.xlsx java.lang.IllegalArgumentException - The given member name 'entity2ID' has no corresponding member in this object of type 'Main.MainEntity'”. At the same time, if I use the same template to import excel for another entity (identical in everything except for attribute values) – import successful. SO it seems the template is fine, but something is wrong with the excel. I removed all formating, but still getting this error.   What could it be?
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