Could have something to do with this .....

SE;

With the release of patch 1.18, the maximum number of retainers allowed to be placed in one market area will be increased. Due to this change, retainers will not be replaced after the version update maintenance is complete. If you have placed your retainer in any of the market areas, we ask that you please call and replace your retainer.

We apologise for any inconvenience this may cause and thank you for your understanding.