There are headers added by the translators to describe who is talking.

After Chapter 1 vs 3 There are four headers in a row

"The Daughters of JerusalemThe ShulamiteThe Daughters of JerusalemThe Shulamite"

The headers actually start after the first line of vs4 and then alternate and are distributed through vs 4.

I can see why they all ended up in front of vs 4......but still!