@chenhsi that, or they next four hits come off of your full stamina after leveling. So if you are at 1xp and click the 5 x 20 button. You will have leveled after the first hit and then 80 stamina would be used after leveling.
a 5 x 20 button is a bad idea. Don't get me wrong I would love it, but you have to remember people would purposely get close to 1xp to next level then use a 5 x 100 with the potential of over 500xp and this would allow some people to continue to auto level after 500 which is not what the developers are probably thinking is in the game's best interest.
Seriously please stop asking for gold for pc.. this will never happen! These developers already give you multiple opportunities at free pc, and this is also their income. Even if pc was 1b for 1 it would be too easy to get especially as you get to higher levels.