Bad radio coverage

Hi,

We are experimenting with one 9 dB antenna on a Cisco 1200 access point.

We first put the antenna on the antenna outlet marked Primary/right. We the
then
disabled diversity and configured the acces point to use the right antenna.
Then we got a
very bad radio coverage.

Then we put the antenna on the left outlet. (which is not marked primary).
Configurated it to use one left antenna. Then it worked with good coverage.

For me it looks as an fabrication error because what they call primary did
not seem to be put on the right outlet as it was marked

Do someone have the same experience ?

Best regards

Lasse