Freelancers not sticking with their bid

[#1]

I'm starting to see more and more where freelancers and especially 'agencies' will bid our budget for a project and then in the comment, after you've wasted a lot of time talking to them, double triple or quadruple the price once they see we are a real company.  As an experienced client from elance and now upwork, we document our projects heavily and nothing 'changes' for their bid to all of a sudden jump.  Can upwork start policing this a bit?  its starting to become a real problem.

[#2]

You are seeing "wishy-washy" behaviour, and instead of giving these people the boot and thanking your astute observations, you are going to let someone else make these decisions for you?

[#3]

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You are seeing "wishy-washy" behaviour, and instead of giving these people the boot and thanking your astute observations, you are going to let someone else make these decisions for you?

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 Gerry, you say the oddest things sometimes. How on earth could significantly raising your price be termed "wishy-washy"?

[#4]

On fixed-price proposals I nearly always say that my bid is provisional (or just a placeholder) and that I won't be able to set a fixed price until I know more about the work. Even so, I usually end up setting a price too soon, and underpricing!