Whenever i would like to go to the nether i step through the portal and begin to load for an indefinite amount of time, as in ive never loaded in, to 'load in' i must restart, and in doing so i tend to spawn in a huge lava lake, thanks to totems i havent lost the plot

This is extremely annoying and random as my portal placement has moved not even 2 blocks from its original place and even so did this so randomly 

Just to add: when i eventually load in, there is no portal to go back through.