I am assuming you are using the latest update of 25?
If so, the zone tool has a new option to label the zone.
That must be on as default.
Simply turn it off before you place the next zone.
One of the forum moderators.
Versions 6.5 to 25
Dell XPS- i7-6700 @ 3.4Ghz, 16GB ram, GeForce GTX 960 (2GB), Windows 10
Dell Precision 3510 - i7 6820HQ @ 2.70GHz, 16GB RAM, AMD FirePro W5130M, Windows 10