I tried creating this page: 225.Poetry.Free Verse.A balcony. (with the period)
So what happened was that Elftown created two pages on me: 225.Poetry.Free Verse.A balcony (which was empty at the time) and 225.Poetry.Free Verse.A balcony.A balcony.
I sorted it out by hiding both pages and recreating 225.Poetry.Free Verse.A balcony again to hold the poem.
Of course, the bug is that I shouldn't have been able to create a page name containing a period in the first place. You have made it impossible to create page names with multiple periods, but not single ones.