Can not add system to sector

[GeneralisimoAR]

Hello,

as you can see in the image I can not add the sector I point out with the tooltip, to the sector but I can add one that is farther away. Anyone does know why?
Thanks

 

[passeris]

Hello,

as you can see in the image I can not add the sector I point out with the tooltip, to the sector but I can add one that is farther away. Anyone does know why?
Thanks

View attachment 1321185

You can add systems that are a maximum of 4 hyperlane jumps from the sector capital. Qapra and Ijaagin look like they are farther than Lazon, but actually they can be accessed in 4 jumps from Alar via Larkin's Singularity, whereas Lazon cannot.