On an initial install, the default is usually "use existing partitions." Most new computers are partitioned into a C: drive for ordinary computing and a D: drive (data drive.). Unless you switch to "erase and use entire disk," PCLOS will put your home and/or swap on one of the partitions.
I've been exploring the advantages of a separate /home partition. It came in handy for me because I had to reinstall several times while learning PCLOS and Linux. I'd reinstall the / (root) partition, but not format my /home partition, thus preserving my settings -- themes, firefox addons, etc. This saved time and aggravation, which is always an advantage. Word on the forum is, this advantage is negligible. With my last install, I Formatted and Used the Entire Disk because I couldn't get my Atheros wifi modem to connect. Turns out the IP's router needed to be set, and had nothing to do with either my computer or the OS I was trying to install.
I asked the forum how to get my /home on a separate partition. General consensus was six of one, half a dozen of another.
YouCanToo had a good point. I too would like to know why PCLOS would create a second swap. Maybe since you have /home on a separate partition, it created one for / and one for /home, just to have it handy. (shrug) I'm starting to go with the notion that, as long as it works to your satisfaction, however it's arranged, trying other arrangements is an academic question.