Welcome to the HFE forums @KoBeWi !
Indeed the bug you mention poses a threat to your progress. It happens for heroes with level equal or above 105. Everyone who reached this level is facing this issue. Reaching such level is not necessary for completing the game however (so you might have to restart :().
This bug was supposed to have been fixed by the end of December 2015 when Marti said:
But nothing came out and Marti has not spoken since then...
Indeed the bug you mention poses a threat to your progress. It happens for heroes with level equal or above 105. Everyone who reached this level is facing this issue. Reaching such level is not necessary for completing the game however (so you might have to restart :().
This bug was supposed to have been fixed by the end of December 2015 when Marti said:
(22-12-2015, 06:52 AM)Marti Wong Wrote:I am now fixing the bug of "level 105 HP hero unable to deduct enemies's HP". If everything's smooth, the Android update will be released in these 3~4 days. And iOS version will come out afterward. Apologize to those affected.Source: https://www.facebook.com/groups/herofigh...844182637/
But nothing came out and Marti has not spoken since then...