Can not see all satellites on network map

I have one RBR50 and three RBS50. All of them work fine with the devices I connected.

However, I only can see RBR50 and two RBS50 (missing one satellite) in network map on Orbi APP.

My configuration is as below.

   1. Cellular phone : iPhone 10 and iPhone 11

   2. iOS : 13.7

   3. Lanuage : Chinese, Traditinal

   4. Orbi APP : 2.6.2.9

   5. F/W version of RBR50 and RBS50 : v2.5.1.16

I've tried following two things,

   1. Use iPhone but change language to English ==> One satellite is still not in network map.

   2. Use Android phone ==> Router and all satellite can be seen in network map without

                                              any setting change on Orbi APP or Router/Satellites.

it looks like Orbi APP has a bug with iPhone base on the result.

Is there anyone have same issue? or know how to fix this issue?