Not strange at all. The main language inspiring pixie is clojure, whose interpreter runs on the JVM. I might even go so far as to say that the main reason to use pixie is because you want to write clojure but can't afford to use a JVM for the task at hand
If we're going by the traditional idea of "bytecode interpreter" or "threaded interpreter", clojure is emphatically not one of them. It JIT compiles the lisp to JVM bytecode; the equivalent in Pixie would be JIT compiling to native code.
IIRC with RPython/pypy the two techniques are interleaved, but most users I've seen opt for some JIT optimization.