I have a strange situation. Isent my BTC from Bitkonan to BTC jam wallet. I was watching the transaction on blockchain. After 15 min got 1 confirmation but after few minutes it turned to be unconfirmed again. What happened?
I'd guess it's most likely due to the block which initially confirmed your transaction being orphaned by the network, where the blocks the network later accepted did not accept your transaction into it - so you'll just have to wait for another pool to mine a block and include your Tx. That assumes your Tx was valid, of course.