Norton Management - Device Status

I have Norton internet Security for 5 PC

It's just the second time, as a fully installed version on one of those PC vanishes away without any action from my side

Having a look on my account, I sow that only 3 of the 5  accounts were in database, 2 missed (but worked)  and had 3 not correct working !! (brown color 'problem recognized')

So I deleted all database accounts (except one) an reinstalled 4 PC with Norton
Looking now on my account - I have 2 correct accounts - and one wrong (brown color 'problem recognized') - (but all 5 PC are working with Norton correct)

My questions

What's the reason of deleting Norton without any action from me from a PC
Why does my account do not show all installed versions, an why can I not change PC-Names in my account ?

[Admin Edit: Clarified Subject]