Thanks for sending through the screenshot. I can now see what's happening here. VS Codelens is distorting the line marker coordinates. Where a line has a codelens block attached to it, the actual height of the line is about double what it normally would be. This makes the marker appear offset with the physical code.
It's very hard to make promises on whether I can fix an issue like this, as VS integration always has a way of dropping roadblocks in this area, but I'll see if there's anything I can do. Thanks for taking the time to report this.