Presto_Dynamo

I've looked everywhere for a solution to this problem and can't find one. I'm sure it's super simple. I hit play, the mods load, but instead of going to the screen that allows me to select my friend's server it jumps me into a new world. Is there a fix for this issue? Or its causes? Or were to find the solution? I'm sure its common but I just don't know how to word it when looking it up in google.