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[V-Man]

:/
It shouldn't now.
I updated "addcheck" to make it (really, this time) check whether the given string is already in the alias before adding it in. You should be able to either put it in autoexec.cfg or type it in-game and both will only add it once.
Do you have the tools.cfg that says

[SELECT ALL] Code:

alias addcheck [if (strstr (getalias $arg1) $arg2) [] [add2alias $arg1 $arg2]]

instead of

[SELECT ALL] Code:

alias addcheck [if (strstr $arg1 $arg2) [] [add2alias $arg1 $arg2]]

?