I was just playing around with the Project Statistics and Word Frequency options, and I noticed some odd results on the Selected Documents tab:
In all those cases the first word and the period (stuff. things. ends.) were at the very end of a document, and the next word (the, more, yet) were the first word of the next document.
I tested a few other punctuation marks (,!?) and this didn’t happen with them. It also didn’t occur if there was a space after the period.
This only seems to happen when there is a period with no space between two words, or when selecting multiple documents and there is no trailing space after a period at the very end of a document,