The mempool is a dark place. I think what it comes down to in your case is just that not every node has all of the mempool. There's two ways you could go about it:
Manually try to increase your mempool. I'm sure there is configuration in geth that determines things like max mempool count, max connected peers etc. Increasing those will help. You can also run ...
No, it cannot. Miners will look at each individual transaction and decide whether or not that single transaction is profitable for them to include in a block. Future transactions don't affect current ones.
Underpriced transactions may stick in the mempool for two weeks or so before expiring.
If the transaction is seriously underpriced it is not going to be picked up by EtherScan in the first place. Usually these transactions do not go through at all. But the safest bet is figure out how to speed up the tranaction or cancel it using MyEtherWallet. It is very ...
Your new transaction has been marked « success » by Etherscan (https://etherscan.io/tx/0xfa14e402325f30b24add5d897cb801d31486669f6d48f14348b6844955946a03).
The network is currently overloaded so your transactions may take longer to proceed, according to the allocated gas price.
You can follow the average gas price here : https://ethgasstation.info/.