Can not level up pass 6 of 8 on Green Hero Hisan. Been feeding since maxed out for a month hundreds of Hero’s.
Mine is stuck ay 6/8 too… not sure if it is a bug but it is super annoying.
Awe all get one hero that gets stuck like this. It’s not a bug just a nuisance.
My solution to this is not to stress over it but whenever I log in first time in the day I make sure to feed just one hero of their colour for their breakfast. It has taken me six or seven weeks sometimes to get the special maxed but it does happen eventually