Nice link and very good pics timwing.

It has always intrigued me to see the Polish flag on the nose of aircraft painted in ‘normal’ and ‘flipped’ versions. Going through the pics one can notice the flag painted with a red square either at the top right or top left.

Anyone can put a reason to this anomaly?

Most likely they didn’t know the proper positioning.
http://forum.keypublishing.com/showthread.php?119197-WORLD-AIR-FORCE-ROUNDELS&p=2308141#post2308141