[Chyakka]

You're passing two seperate arguments for the contents of the dialog.

Code:

"Item\tCost(zCoins)",  "AK-47\t7\n\
                    M4A1\t7\n\
                    MP5-K\t6\n\
                    CZ61 Skorpion\t4\n\
                    PM73 RAK\t5\n\
                    Glock 19\t3\n\
                    Silenced Pistol\t3\n\
                    FNX45\t5\n\
                    MP-133\t6\n\
                    SPAS-12\t10\n\
                    A.H Fox\t6\n\
                    B95 Rifle\t10\n\
                    Alejandro Sniper Rifle\t13\n\
                    Knife\t2\n\
                    Baseball Bat\t2\n\
                    Golf Club\t2\n\
                    Pool Cue\t2\n\
                    Chainsaw\t5\n\
                    Fire Extinguisher\t5\n\
                    Shovel\t2\n\
                    Katana\t2\n\
                    Nitestick\t2\n\
                    Cane\t2\n\
                    "

Should be merged into one, with the DIALOG_STYLE_TABLIST_HEADERS style it's just the first line before \n that will be the header of the dialog.