Thank you for your answer. Please comment the following.
1. When it comes minted transaction, a half of my balance goes immature. correct behave? Staking is true.
2. If there comes another mint (before first was confirmed 101 times), all the balance goes immature and staking goes off. correct?
3. When all immature mints become confirmed the staking goes on. correct? BUT! on some of my mac os it really goes on (os x 10.13.3), but not at another one (os x 10.12.6) — until restart the ICH wallet. that's a bug!
4. Sometimes staking goes off on my os x 10.13.3 (more stable) with only one unconfirmed mint. mintablecoins=false — could you explain this criteria, please?
I have about 6000 ICH coins on balance, 600 or 610 zICH (two of mentioned os x shows different zICH balance). that's also a bug!