But why I see them? In settings it is marked "Hide orphans". And why after reinstall everything works fine for a few days, and then again only the orphans go? I have saved debug.log from previous installation. Can it give you some information?
You're not the only one experiencing this problem, everyone is seeing orphans. It seems like the Hide Orphans feature simply isn't working currently. We will let the developers know about this if they aren't aware of it already.
Can you explain me, how i can send my zerocoin back to my basecoin to mint them again, please ?
Something like this ? :
spendzerocoin false true 42
Thanks
Yes, that command is correct for spending zerocoin.

Put in a basecoin address if you would like them to be spent to basecoin, put in a stealth address if you would like to spend them in CT (not recommended for 1.0.1.4 because some people are having issues, but up to you). You can also specify an additional argument at the end if you want to specify what zerocoin denomination to spend from, i.e.
spendzerocoin 100 false true 42 bv1...asd 1000 will spend 100 back to basecoin from your 1x1000 zerocoin denomination and return the change as RingCT.