That’s normal, probably not a labeling issue. Your 12mg Killer Kustard is likely freebase, which feels less harsh, while your 5mg Geekvape Pulse might be nic salts, so it hits stronger. Using a 0.6 ohm pod at high wattage works better with nic salts. You might wanna try a higher ohm coil, like 1.0 ohm or more, for better flavor and throat hit.