Getting wavy pictures during engraving

Alright so I’ve tried everywhere so hopefully I can get an answer here. My laser has just over 12 hours on it and I get wavy images when the image goes from big to small. Everything else is perfect. Perfect parallel lines and the rest of the image up to that point. In the image attached all the rectangles are exact replicas at 45 degree angles. The outer square was done with the same setting as the inner square, but when I shrink it like the smaller one in the middle it comes out perfect. Belts are tight and mirrors are aligned. Currently running 150 speed with 13 power and .08 interval. And help or suggestions would be greatly appreciated!

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