Resize going wrong

Hello everyone,
Just noticed something that I don't recall experiencing in the past.
If I resize transparent images, the edges will be messy.
 
   


I assume it's because the images are raster images, not vector images, but in the past I think I could resize without any problem.

Does anyone has a solution for this?

I tried re-sizing the image on Photoshop, it seems fine.

I must have messed up some settings in Paint Shop Pro then.  
Thank you!

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