X Tensioner and Pully for 2GT toothed idler pulley, 6mm belt, 4mm bore

I Decided to replace the smooth idler pulleys with teeth pulleys and I found these on alliexpress.

https://www.aliexpress.com/item/1Pcs-2GT-16-teeth-20-Teeth-synchronous-Wheel-Idle-Pulley-Bore-3-4-5mm-with-Bearing/32726309946.html?spm=a2g0s.9042311.0.0.pqIYK6

https://www.aliexpress.com/item/1pcs-2GT-Idler-Pulley-With-No-Teeth-Perlin-Passive-Pulley-Idle-Pulley-Bore-5mm-For-GT2/32738095464.html?spm=a2g0s.9042311.0.0.pqIYK6

The only problem was when I install them with this X Tensioner,