Because of how lockouts have worked since WoTLK until SoO there was only 3 types of raids LFR/Normal/Heroic you could only do norm or heroic not both .I have linked you how it works its been like that 10 years .
Because of how lockouts have worked since WoTLK until SoO there was only 3 types of raids LFR/Normal/Heroic you could only do norm or heroic not both .I have linked you how it works its been like that 10 years .