CANN and CANNA is similar WALLET ADDRES..
This is Very RidiculousI do mistake sent 1000 coins CANNA to address CANN in BITTREX..and I REally surprise..Approved!!!!!!
Look here...This my CANN Wallet addres in Bittrex.. CfJ3NK87PAjErUKBjwLdLSZwgdizefcjBX

CfJ3NK87PAjErUKBjwLdLSZwgdizefcjBX
and This My WALLET CANNA...look CANN addres, YES I do mistake..but APPROVED..??soo this wallet addres CANN and CANNA is similar..??

That's a known issue, be very careful while sending cannabiscoin and cannacoin to their proper wallets.
Though that is a bit odd.