I don't think that the fact that it's statically typed is the problem. For example, I don't believe a competent Rust, Go, or Haskell dev would be at a disadvantage due to static typing, but rather the opposite.
Candidates using those languages can often sketch out the right algorithm and the structure of what the program would look like, but under time pressure have trouble producing something that actually will compile and run properly (and as much as I want "showed they got the right algorithm and how to do it" to be a pass, it isn't always). The "executable pseudocode" nature of the popular dynamic languages is a big advantage there.
It's definitely even worse for C#/Java style languages (though C# is better than it used to be), because of all the heavyweight design pattern stuff you need to implement to do things that are just natural idioms in the dynamic languages. But it's something I've seen happen in a broad range of static languages.
In coding interviews, some interviewers want compiler approved code. That's a lot less writing with python than with C#. The problem is I'm just not as confident with python as I am with C#. If you want compiler approved board code then I've got to write it with C# and not python.
1) are less verbose
2) don't require worrying about typing
3) have really easy ways to manipulate strings, iterate, etc., which are often found in interview style problems
Java and C# have many advantages over python and ruby, but I think that they put you at an inherent disadvantage for many interview style questions which often require you to solve an algorithmic or data structure type problem in a limited amount of time [1].
[1] This doesn't explain why people using Go would tend to pass at higher rates, but since the Go community is comparatively much smaller, there could be other factors at play there.