I know the reason for most of my orphaned blocks. Daemon blockchain is buggy, really.
I've mined block 83285 with hash 77e952ddc8ea36cf357b93b77b6a80560c41854e2c9917ba4c1853e7acec55ce (see
https://explore.leviarcoin.org/).
But a
print_block 83285 returns
block_id: bf242371ea86b300aed3b38e41d232d8a8ca34f82a4a15cb50cb6d27ac1ceb0b
WTF? Why does the coin daemon my pool is connected to, return another block hash completely different than official blockchain?
EDITprint_block 83286 returns
block_id: 77e952ddc8ea36cf357b93b77b6a80560c41854e2c9917ba4c1853e7acec55ce
So my blockchain, which is right now completely new synced, is one block ahead of official block chain!?