Lan multiplayer

When me and my friends want to play multiplayer I am the server but ever since the 1.9.0 update we couldn't play most of the worlds anymore the worlds does not appear even when we restart the wifi/hotspot of my phoneor restart all of our minecraft and when it does pop out it says the world is saved on single player and when I go to the settings on the world its on then when I open the world and look at the settings its off even though i just turned it on please fix this because we cant play lan multiplayer anymore