发现了C++虚继承构造函数顺序中一个非常奇怪的问题，求大佬解答

#include<iostream>
using namespace std;
class Writing {
public:
	 Writing() {
		 cout<<"Writing constructor"<<endl;
	 }
	 ~Writing(){
		 cout<<"~Writing"<<endl;
	 }
};

class Racing {
public:
	 Racing(){
		 cout<<"Racing constructor"<<endl;
	}
	~Racing(){
		cout<<"~Racing"<<endl;
	}
};
class Weekend:virtual public Writing,virtual public Racing{
public:
    Weekend(){
        cout<<"Weekend constructor"<<endl;
    }
    ~Weekend(){
        cout<<"~Weekend"<<endl;
    }
};
class Workday:virtual public Racing,virtual public Writing{
public:
    Workday(){
        cout<<"Workday constructor"<<endl;
    }
    ~Workday(){
        cout<<"~Workday"<<endl;
    }
};
class Choseday:public Workday,virtual public Weekend{
public:
    Choseday(){
        cout<<"Choseday constructor"<<endl;
    }
    ~Choseday(){
        cout<<"~Choseday"<<endl;
    }
};
int main(){
  Choseday day;
  return 0;
}