Have you checked whether it ever changes for the people it doesn't show for? If the offset is 0, it won't show anything.

I see that offset has been added to the 2nd duel screen, thank you. I'm still confused on what it means when it doesn't show offset

When I wined my 33 and dueled myself it showed a huge offset. Lvl 13 combat w 40 atk. When 0people who duel u do not have +hp or -hp. It shows nothing.

I see that offset has been added to the 2nd duel screen, thank you. I'm still confused on what it means when it doesn't show offset

I'm 99.95% sure if no offset shows it means your opponent has gained no HP levels through questing or using wines to train their attack level

I thought it was based on your hp to theirs?  So if it doesn't show you've both got the same hp.

~K!zL

Offset is the hp value for what the main stats should be.

For example, a lvl 13 that levels up using wine and boxing to only get Attack xp will have 40-1-1-10hp at lvl 13. 

If you plug 40 attack into the calc you will come up with:
40-1-1-30hp
Since 37,224 (lvl 40 combat) / ~3 (you gain about 3x more att xp then hp per kill) = 13,363 into hp xp giving 30 hp (wining gives none of that xp).

and should be level 18 not 13, so someone who wined would have a -20 hp offset (based on what their hp should calculate at ~1/3 rate of att+def+str stats (shown when they right click and duel).  This is due to having to get 99att 99def and 99 str to get 99 hp (essentially about 1/3 less xp)

Another example is my lvl 63, my stats are 42-1-99-94 and i have a +7 offset, due to 42-1-99 giving 87 hp (i killed another 30k rats or so in str for extra hp xp).

Long story short, a - offset means they have more combat stats then what their hp should have given them (ie more attack) + hp offset will usually mean they have 99 in a stat and have trained extra in hp (unless its a low level like 13-40s as quests can level you up some with hp xp (witch house and a few others).

Hope that jumble helps