edebug-unwrap-results is a variable defined in `edebug.el'.
Its value is

Non-nil if Edebug should unwrap results of expressions.
That is, Edebug will try to remove its own instrumentation from the result.
This is useful when debugging macros where the results of expressions
are instrumented expressions. But don't do this when results might be
circular or an infinite loop will result.

You can customize this variable.