I have been seeing this a lot for a long time with a lot of leveled lists. The setting Calculate from all levels <= PC's level does not work.

I just tried to play a character that did not use/perk Enchanting. I never found a ring or necklace that gives resistance to frost, fire, or frost. At one point all I ever found were rings from the LItemEnchRingFortifyHMS list, which is in LItemEnchRingAll.

The LItemEnchRingAll list many different leveled list for level 1 (and the <= PC setting), but for level 16+ it is only LItemEnchRingFortifyHMS which is the only type of ring I found after level 16.

I have also seen this when mining geode ores in Black Reach. All I find are grand and black soul gems, even though that leveled list is LItemSoulGemEmptySpecial, which has the <= PC setting. I tried to change this, but failed. I still see only grand and black.

Another is LItemMiscVendorSoulGemEmpty. I noticed that vendors never have empty common soul gems. I have made my own changes to the LLs used by vendors to make sure they continue to sell empty soul gems (petty - common) as I level up.

I have also changed blacksmith's container and leveled lists to ensure they keep selling ores and ingots below ebony as I level up.