After arranging the models in spectrum neatly and when Spectrum discovers the model again, it moves the (off page ref models) to the left side and makes the toplogy a mess.
Release : 10.3
Component : Spectrum Core / SpectroSERVER
This is a known anomoly in Spectrum.
Grouping models together can provide some relief to this.
The other option is to not display off page references in the topology.