That looks like there are two via's on top of one another, which could cause this.
Although looks like it, there is actually only 1 via.
Are you sure there is only 1 via, that ghost text is a pretty sure sign there are 2 vias on top of each other.
How did you confirm there's only 1?
Select the via and change it's hole and pad size to be very small, like 0.1mm and see if that visually changes what it looks like or not.
If its two via's on top of each other then whichever one you select and change it's size wont make a visual difference because the other is still there.