Hello, Here is the info about the explosive modes.

Explosive Mode: Madara receives Super Armor and heals himself based of 10% of his Ninjutsu damage dealt.
Explosive Mode Level 1: Madara receives Super Armor and heals himself based of 12% of his Ninjutsu damage dealt.
Explosive Mode Level 2: Madara receives Super Armor and heals himself based of 15% of his Ninjutsu damage dealt.
Explosive Mode Level Y: Madara receives Super Armor Level 2 and heals himself based of 10% of his Ninjutsu damage dealt.

As for the bugs, this is a known issue, and we have been told that they should be fixed in about a week or so. Sorry for the inconvenience!