Why is the image of Hit Sprite larger than the starting state?

[punkysuen]

Block Square, Block Broken 1 and 2 are all 128x128pt.
However, when we hit a 2-Hit or 3-Hit Block, the Block Broken 1 and 2 sprites are larger than Block Square.
Feel quite strange and cannot figure it out yet.

[Nina]

Hi punkysuen,

Click on the sprites in your Assets folders. If they are all 128 px wide, set their Pixels Per Unit value to 128. Did this fix it?

[punkysuen]

Thanks!!!
I totally forgot what I learnt about Pixels Per Unit setting on sprites