Reverse Proxy

Hi there! I have a Microtik CCR1009 and want to access my NAS from inside and outside of my network with the address I configured. I have a nginx reverseproxy in my network and I have configured a ddns to access it from the internet, it works great but when I am in my home network when I try to reach the NAS it goes to the router interface…can someone help me figuring out what is wrong?

Thanks!

I have found that my problem is more common than I taught! I have followed the tips on this thread:http://forum.mikrotik.com/t/hairpin-nat-the-easy-way/146718/1 and solved my problem!
Thanks!