Mystery errors in data analysis

Videos that spit out analysis errors, but appear to have correct labels files. ERROR Video 11: Tried to remove singleton (probably nonexistent) block blue rect Cannot find where this error would occur- labels file looks correct to me (but this is a complex example, the whole structure breaks apart multiple times) ERROR Video 90: Connected studs aligned along both axes Cannot find where this error would occur- labels file looks correct to me ERROR Video 242: Tried to remove singleton (probably nonexistent) block yellow rect Cannot find where this error would occur- labels file looks correct to me