Not being able to target alliance faction based npc

i created a monk character on the Mankrik mop classic server. Once i got to the choice of faction i chose alliance and got to about lvl 23 and then deleted the character to make a new monk with the exact same name to play with my brother on the horde side. i am now lvl 19 with this newly made character and have arrived at the entrance to the ashenvale gate when i tried to do the quest “mor shan defense”, however i cant do this quest as i found out that i am unable to target any alliance aligned faction npc. whether it be the night elves you’re suppose to slay or any other alliance npc, i cannot even target them to fight and i am only brought with the message “you cannot attack that target” however their name is red and they are able to attack me. I am able to attack anything that doesn’t have a alliance faction alignment. pls help :frowning: