Warlock spells that are lower then your max spell level have to be manually selected to be cast. If you cast hex it will use your sorc spell slots. If you manually click on the purple spellslots it will show you a menu of your spells. Then it should work, if I understand your issue correctly. Just cast the spells from your menu not the skill bar
This is not possible because the warlock spells are bugged and do not appear in the warlock only menu. All warlock spells only appear in the sorcerers max level slot menu. In this case level 2 slots. It keeps increasing as you level sorcerer.
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