NinjectValidatorFactory is creating multiple instances of a validator

Question

I am trying to use Ninject FluentValidation and am having a weird issue -- when I submit a form, the constructor for the validator is being called 32 (!) times. If I remove the configuration, the constructor is only called once (but of course no injection takes place). The only thing I can think of is I should be setting up the factory somewhere other than NinjectWebCommon, but I don't see anywhere else I have access to the kernel to do so.

Any ideas why the validator is firing so many times?

In RegisterServices() in NinjectWebCommon.cs:

NinjectValidatorFactory ninjectValidatorFactory = new NinjectValidatorFactory(kernel);
FluentValidationModelValidatorProvider.Configure(provider => provider.ValidatorFactory = ninjectValidatorFactory);
DataAnnotationsModelValidatorProvider.AddImplicitRequiredAttributeForValueTypes = false;

In the validation resolver:

AssemblyScanner.FindValidatorsInAssemblyContaining<CleanupSiteValidator>()
            .ForEach(match => Bind(match.InterfaceType).To(match.ValidatorType));

EDIT: I added InRequestScope() to the resolver and the constructor for the validator now only fires once, but CreateInstance() in NinjectValidatorFactory.cs is still firing 32 times. I suppose this is...better, but should the factory be called this many times? It seems there is still something wrong.

AssemblyScanner.FindValidatorsInAssemblyContaining<CleanupSiteValidator>()
            .ForEach(match => Bind(match.InterfaceType).To(match.ValidatorType).InRequestScope());