Negative HP on hero

I have the situation where I am finding one of more of my heros have negative Hit Points after a battle (where they took a lot of damage)

ie, rather then being 0/10, they are appearing as -2/10 etc, worst i have seen is -3.

This may have something to do with the fact that I am coming back after not playing in 3 months?

I have also noted that I have a level 9 HI that has more XP then my level 10 HI's (all levels gained before my 3 month 'holiday'), and the level 9 needs still further XP to get to level 10. I guess the XP requirements for the levels changed in the last 3 months, but that existing levels werent recalibrated?

I guess the level should fix itself when you level your HI up... ;p and yea the xp levels changed... people complained... but now it's all good.

Hero negative HP, however, is randomly frequent for many of us. Would be nice to see it fixed.

yes, others have suggested the health items possibility. except it happens to heros that dont/didnt have health items on it (easy for me to test, as i only have one hero item with + health)

It might be as simple as the hero's hp not being floored at 0 when shot by artillery or taking more than 1 damage at a time. Not sure, but happens to me a lot and I practically never use health items. Worst I have got is a hero with -4 hp, I think after a match where I got bombarded by artillery.

Also, I have got -1 exp on a unit before from a battle!

I've found and fixed a bug on this with equipping items and chaning tab. Will be live after the next maintenance. Thanks everyone.