Anyone had this problem?

Hello everyone,
When im trading on my phone on MT5 sometimes when i close the trade by pushing close by market, my trade does close but then it will open a trade up automatically in the same direction, what is causing this? so say i buy EUR/GBP at 0.78900 then sell at 0.78910 my phone will close the trade but then open up a sell at 0.78910 so then obviously i panic and have to close the trade at a loss. Anyone else experienced this problem? is it MT5 or my phone or the brokers fault? Thanks.