Units that were upgraded to high levels at the beginning of servers [HWW, Blitzkreig, and other historical maps] seem to sometimes demote and go back to level one. It's a "tad" bit annoying.
"Never fail to honor your people. When a true leader's work is done and his aims fulfilled, they should say and believe 'We did this ourselves.'" - US Army General George S. Patton Jr. [1885-1945]