please prepare a project (aia file) as small as possible, which demonstrates this issue and describe exactly, what needs to be done to get the problem
also it would probably help to describe, how you test (which device and resolution)
if you resize the sprite to 320x320, as far as I was able to see (without using glasses ;-)) you do not get the problem (can you confirm that?)
it seems to be the large sprite 926x926 does not have the problem anymore on the API4 test server?
Taifun