Hey, just wanted to let you guys know this 4 year old bug is still in game and never got fixed. Original post can be found here: Item Roll Information (Tier/Range)
To summarize, since it looks like the devs were having trouble understanding the original post:
Start by going into Settings->Gameplay and UNCHECK “Auto-Compare Items”.
Current item behavior is now: when mousing over item, hold alt to see mod explanation, hold ctrl+alt to see mod ranges (with a unexpected forced compare since ctrl also compares).
Next, go back to Settings->Gameplay and CHECK “Auto-Compare Items”.
Now the current behavior is: holt alt to see mod ranges (previously ctrl+alt) (with expected compare), hold ctrl+alt to see mod explanations (with unexpected no compare).
What it looks like is happening is that the setting auto-compare is making the game believe the ctrl key is being held down for purposes of mousing over items. Due to the current key bindings, this is kinda scuffing things up and creating unexpected and unintended jumbling of the controls.
You could fix by changing the way this setting behaves, changing the keybindings, or whatever way. You do you, but it is currently bugged (and has been for 4 years apparently). Minor bug, but there it is.
While you’re at it, a setting to Always show Mod Ranges would be appreciated. 
Shoutout to Arazim (Profile - Arazim - Last Epoch Forums) who pointed out this post belonged in the bug report forum not the feedback forum. He sounded like a jackass in the way he pointed out, but it’s still a valid bit of info even though he presents as an asshole.