Don’t know anything about Corel, but when we see something like that in Illustrator it is usually because there would be a white fill inside of the “Sav” sitting on top of the colored background instead of having had that shape subtracted from the background.
There has been a case of a similar issues with CorelDraw saved SVGs before, with a full thread discussion on it here, (along with work arounds), if I recall correctly:
