When I mine with my phone and PC at the same time, the coins mined are different.
If your phone lags at all while running a webgl game in the browser it might be that the miner is lagging as well.
Regarding mining withdrawals, all are saved and are on deck to be sent out and will be sent as soon as the SafeLow is 1 gwei. I tried sending out all requests this morning but it was going to cost about $98 worth of gas just to send out the current requests, whereas when the SafeLow is 1 it will be under $10. For most the of the year the blockchain was at 1 however it is just being over used at the moment. Hopefully things calm down this month but either way all mining withdrawals are saved and added to the list to go out when the SafeLow is 1.
Edit: Great news, the SafeLow is back 1, we have used our smart contract to begin sending out withdrawals, and they will continue to go out today and in the coming days. Your total withdrawals may be done in multiple parts depending on how many times you withdrew and if you used the same address or not (It is preferred that you do use the same wallet address). I will post here again when all withdrawal requests have been processed.