Screens Page | Navigation Arrow Displacement

The problem: On the very first page, the Screens navigation arrow behaves appropriately in both desktop and iPad modes. In iPhone format, however, it initially appears centered on the screen, as it should, and then moves abruptly to the right (see attached image). And even worse, it almost completely disappears from the screen, despite a fairly hefty 8% distance from the bottom.

The RW7 file:

The website page:

Thank you.