I have been playing the Beta version as the Mimot Brotherhood and have been experiencing some strange behavior when invading planets and when my planets have been invaded.  The first screen snapshot shows that I own a planet named Iridia and its Planetary Defense is 34/34.  The second screen snapshot shows a single Level 1 D.L.S. Transport that is trying to invade Iridia.  I would expect that my planetary defenses would have to be reduced to 0 and then 1 or more weeks would have to pass before the invasion was successful.  But, when you go to the next turn you will see that the D.L.S. Transport successfully invaded Iridia (third screen snapshot).  Why?

On the other hand the fourth screen snapshot below shows the planet named Aljanah IV that is owned by the Iconian Refuge and its Planetary Defense is 0/37.  It is being invaded by 2 of my transports whose properties are shown in the fifth screen snapshot below.  This invasion has been going on for over 10 weeks with no success. Why not?  When you go to the next turn, you will see that the Planetary Defense is now 3/37 (sixth screen snapshot below) even though the planet is still under invasion by my 2 transports.  Why?

It appears to be impossible to predict the number of weeks it will take to invade a planet or whether it will even be possible to invade a planet.  Do you need to display additional information before and during an invasion?  Are there factors we cannot see like defending fighters?  I seem to have to attack planets I am invading about every 3 turns to defeat some kind of defenders that do not show in the planet's property window.

The bottom line is that invasions, both the ones I am doing and ones I am defending from, are not consistent and information is lacking to enable me to make informed decisions.

Here is a link to a save that will let you see the above issues: 

https://www.dropbox.com/s/uhbdukkf5lbaifl/DemoOfInvasionIssues.GC4Sav?dl=0