[Solved] UnitBuffLeftTime question (use UnitBuff not UnitBuffInfo)

Probably I'm doing something wrong... Somehow the indices in UnitBuffInfo( unit, int index ) and UnitBuffLeftTime( unit, int index ) seem to be mixed up...

I have the following buffs

an this code:

for j=1,100 do 
    local buff_name, _, _, buff_id = UnitBuffInfo("player", j)
    if buff_name ~= nil then
        local buff_time_left = UnitBuffLeftTime("player", j)
        
        DEFAULT_CHAT_FRAME:AddMessage(buff_name.."-"..tostring(buff_id).."-"..tostring(buff_time_left))
    end
end

which gives

Fine:

* Fioletowa Aura-1500333-nil

* Cierpliwość Arcadii-1500765-nil

* Opieka nad Wierzchowcem VIII-502986-438.4860534668

* Wiążąca Umowa-620951-nil

* Kryształ Natury-503948-nil

* Sys1501924_name-1501924-nil (probably, no idea :P)

But the rest is mess:

* Modlitwa Zniszczenia-1501466-6136.5874023438 - left time should be nil, seems to be time left for Dusza Trenera Broni-1500352

* Sys1500766_name-1500766-5.334990978241 - this seems like time for Przyspieszenie Kryształu-620703?

* Dusza Trenera Broni-1500352-nil - the 6.1k above would be right

* Przyspieszenie Kryształu-620703-nil - the 5 seconds above would be right

I'm probably doing it wrong: what is the correct way to find matching UnitBuffInfo and UnitBuffLeftTime?

BTW 1: using combined UnitBuffsInfo("player") gives correct values (Acradia specific API, with "s")

BTW 2: but I'm pretty sure that UnitBuffInfo( unit, int index ) (without "s") and UnitBuffLeftTime( unit, int index ) based on index as above used to work... Is it possible that it got broken/the meaning of parameters has changed?

Ah, yes, for UnitBuff and UnitBuffLeftTime indices match.

Thank you!

(PS: Also, now I see: UnitBuffInfo gives not only hidden buffs but also debuffs without any indication what is what...)