I think multiple close reasons should be mentioned for the following reason: if I vote to close for a 'minority' reason and I want to explain why the question is closed, I have no idea! If I close to because it is off-topic, I have no clue why other people say it is too broad. New users are confused, why can't people tell him this question is too broad! Clearly, according to this user, SE is populated by people who cannot back-up their arguments and shift their position (i.e. 'moving the goalposts') when convenient!
Now, all this can be solved by explaining this to the users, but do we have to do this? Please, for the sake of not confusing the user, show that there have been multiple close votes OR
Add an additional text like this (in case of possible multiple close votes):
Please note that this is the majority reason to close your questions. It is possible some people voted to close because of other reasons. Look at the help center to be sure your question doesn't have any problems other than the current close reason or try to ask the users who close voted to explain their reasons.
Please, it would help a lot if this message that is often directed at new users is less confusing. Thank you. This message should be easy to implement and would help a lot.