A few words of preceding and following pages of "Start Reading" page are misaligned. The problem disappears at the "Keep Reading" page.
I am able to reproduce this issue and will report the issue to Development for investigation.
For me, I can cause the text overlap just by checking/unchecking items in the 'Display' drop down. It appears at/toward the top of the page even when I don't have reading plan markers in view. In continuous scrolling view (columns set to 'None') scrolling up or down a little corrects the display.
I can also reproduce the issue in the ESV, as well, so it's not just an issue with the KJV1900.