e.showScroller Example From API Reference Cuts Off Some of the Text as you Scroll.

Just checked on this and it's to do with pixel-doubled fonts and clipping rectangles. It'll need a firmware update, which I'll get on tomorrow.

Best bet is don't use pixel-doubled fonts. On Bangle.js 2 if you use 12x20 or 6x15 or Vector it'll be ok:

E.showScroller({
  h : 40, c : 8,
  draw : (idx, r) => {
    g.setBgColor((idx&1)?"#fff":"#ccc").clearRect(r.x,r.y,r.x+r.w-1,r.y+r.h-1);
    g.setFont("12x20").drawString("Item Number\n"+idx,r.x+10,r.y+2);
  },
  select : (idx) => console.log("You selected ", idx)
});