Holosun red dot won’t hold zero

I have a holosun red dot on my 16” carbine, but ever since adding the holosun riser, it doesn’t hold zero throughout more than a couple shooting sessions. I used blue locktite and went just past snug instead of actually using a in-lb wrench. It hasn’t come loose, but it seems like I have to adjust the sight every session and it still isn’t perfect. I’m a noob and not sure if I need an aftermarket riser, or if im just doing something wrong with the gear that I have