I play on PS3.
Is only Masser there?
Sometimes that happens. It's just the moon cycles, nothing to worry about
It's the normal moon cycles. They are not always together.
The void nights has begun again... M'aiq shall now run towards the hills.
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As Pluto stated above, it is just normal moon cycles.
Don't worry, The thalmor shall save all of your kind kitty.
And yea, The moon cycles are always there.
I put these questions to the OP...
When did you notice Secunda disappearing? Was it immediately after you loaded a save game where previously it had been in the sky?