Title: Clan boss showing zero damage after taking 1.2 million damage on easy

Device; iPad Pro

iPadOS 13.3.1

Steps taken; Checked in to clan.

Tried to claim reward, message said your have already claimed this award.

Closed app and relaunched.

Clan reward was now showing as claimed.

Clan boss was showing as 100% no damage taken.

Attacked clan boss on easy.

Finished and Caused 1.2 million damage.

Clan boss still shows as 100% no damage taken

Description of the issue. 

Clan boss key used and no damage caused to clan boss.