This is Happy Wars management team.
Equipping certain items on the Xbox 360 version of Happy Wars will cause your character to unequip all items when entering a match. This issue will be fixed today, June 2nd at 9 am (UTC) when the latest update is released for Xbox 360.
The Windows 10 and Xbox One versions of Happy Wars are unaffected and can be played normally.
We apologize for any inconvenience this may cause. Thank you as always for playing Happy Wars.
About items being automatically unequipped on Xbox 360