Can you please help explain why this transaction seems stuck

transaction1d83b814833500a2702cfe81e7f49de6f6d4dfe16f69bf226817e75a9e12440eIt was done at same time as 12 other transactions from electrum wallet, 6 of which have gone through without a problem. 6 seem stuck despite saying high priority. total amount for all transactions was less then the balance on the wallet so i wasnt spending btc i dont have. driving me crazy. via /r/Bitcoin http://bit.ly/28ZJGcU