There are multiple comments describing this issue.
In my case :
At first those skins made my game crash with this error code :

############################################################################################
FATAL ERROR in
action number 1
of Step Event0
for object cs_playercursor_obj:

second index out of bounds request 0,-2 maximum size is 1
############################################################################################
--------------------------------------------------------------------------------------------
called from - gml_Script_get_color_taunt_value (line 7)
called from - gml_Script_update_char_color (line 279)
called from - gml_Object_cs_playercursor_obj_Step_0 (line 1078)

After Unsubscribing and Subscribing again to re-download the mods, The skins dissapeared altogether.
Selecting them is impossible, they don't appear anywhere.