weapons not working?

[randomencounter]

when attacking someone, i have 7 of the item called "master's claws" cause i have 7 clan members. but back to what i was sayin.. everytime i attack when i lose i see that my enemy was able to use this weapon..but it doesnt let me attck with that weapon? i wasnt able to take a screen shot due to problems with the photos icon on my iPod. but you dont need a pic to know what im talking about

does this happen to anyone else? what should i do?