You updated USSEP without updating Skyrim. You have two choices:
: Despite being an older version, USSEP 4.2.5b fixes hundreds of gameplay, quest, and NPC bugs that Bethesda never officially addressed. How to Find and Install USSEP for 1.5.97 skyrim ussep 1.5.97
If you are building a modlist today, you might wonder: Is 1.5.97 still the gold standard? Here is everything you need to know about maintaining a stable 1.5.97 setup and finding the elusive to match it. Why Version 1.5.97? You updated USSEP without updating Skyrim