Too many SSID's: openwrtbound etc

Hello guys

So we've got a TP-Link TL-MR3420 v2 running LEDE Reboot 17.01.4 as a repeater. And it's running fairly smoothly.
However, it appears to be sending out several SSID's. Of course, it's sending out our main one, but it also appears to be sending out 3 others: OpenWrtBound, OpenWrtGuest and OpenWrt4300_2.4Ghz. I don't know why, and I don't like it. A google search on "openwrtbound" gives me but one result.
Can anyone enlighten me on this? It feels mischievous..

Much appreciated!

Look at /etc/config/wireless or the LuCI interface for clues. Those aren't typical for a "stock" distribution, but may be part of a "custom build" if you're using one.