Just to clarify a few things...
#1) Does It stay this way, Even after clearing your Web-Browsers cache & doing a refresh/reload?
#2) When you set up your node... Did you (initially) plug it into the primary router via an ethernet cable, & then disconnect the node & relocate the AX86S afterwards?
Note: it has been my previous experience that whenever I attempted to use AiMesh on RMerlin firmwares the "purely-wireless" setup failed to initialize properly.
While an initial hardwired Ethernet connection during setup, followed up via disconnect & relocation of the node... would succeed.
Or just do as
@skeal just mentioned above...