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@Olly398
My bung gave me some gyp when I changed stem, but it was all solved by a bit of fettling.
Firstly, clean that assembly paste off the bung - you need friction between the bung and steerer.
Then check your stem/spacer configuration, esp as you say you changed stem. Do you have enough stack height to clear the steerer by a good few mm, so that when you tighten down, the steerer and bung do not interfere with the top cap before tension is acheived? You may need extra spacing.
Second, the position of the bung in the steerer tube before you tighten is important. It must be pushed far enough in so it does not expand out of the top of the steerer, but not so far as the bolt will not reach the threaded plate.
Good luck