I am having problems in the salamander city I am fighting and defeating the enemies but they keep respawning and I am unable to get them all before the first ones that I defeated have returned. Am I doing something wrong or is it a glitch?
It's a glitch, I definitely fixed something like that it in the past, just can't remember which version it was. Which version are you playing?
Also it should not be game breaking, after defeating 8 enemies the quest should still progress, so it shouldn't be a softlock.
Feel free to keep me update if you think you are stuck.
I also always could take a look at your save, in the worst case!