how to debug file type recognition

i have two identical smarty files: i load the first one and it gets recognized as "heist". i load the second one and it gets correclty recognized as smarty... how can that happen?

if i start vim with "vim -u NONE -U NONE" and give the commands ":set nocompatible" and ":syntax on", the files are all recognized as smarty, so the problem should either be in my .vimrc or some plugin, but i have no idea where to look for to fix this problem.

thanks in advance.

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