That means that you are trying to use both the Bethesda mod manager and Vortex in the same game. This will cause a lot of problems, when you do this, Vortex cannot 'see' all of the mods, and the conflict resolution will not work. You might take a look at the Vortex extension (Import from Bethesda.net - https://www.nexusmods.com/site/mods/120) that allows you to manage Bethesda mods that you have installed from the game menu. This extension will preclude you from updating the mods through the in-game menu, however. You will have to manually d/l and install these mods through the 'Install From File' option, to update them, I believe.