The success of payments on the Lightning Network depends on a variety of factors that are external to Bitkit or Blocktank. We do not have the capability to diagnose issues related to payment route or liquidity of third-party nodes.
If your payment is failing to any specific third-party provider, we recommend reaching out to them. If you think the payment failure may be a Bitkit bug and not an issue specific to whoever you're paying to, reach out to us.