In general the steps of preparing Alos PalSAR are mentioned here ALOS PALSAR processing
five images are very few to create PSI, at least you should have 20 images or in some case are mentioned within this forum 12 images are good,
Did you add the elevation and Lat/Lon and subtract the topographic phase in the step of Inteferogram creation?
In your screenshot it is not clear what is in the first and the second raw!