Possible Clues:

• Irregularity encountered probing army's new centre in Pontypool
• Unbalanced state affected my mastery
• Lopsidedness
• Imbalance, or, parsed differently, kind of balance shown by the circles
• Lack of balance provoked two lots of my tears
• Imbalance between two sides
• 1984 movie with a 100% positive rating on Rotten Tomatoes, with 'The'
• Lack of similarity between two parts or halves
• Difference between two sides
• Feature of much modern architecture