Nether update bug : portals wrong coordinates when coming back

Hi Team,

I have a nether portal in my house that worked fine before the update. coordinates 800 87 200 that links up to the nether at 105 38 39

It goes to 105 38 39 fine, but when i come back, it links back to 900 16 342 !! 

I tried several times, always the same.

 Also, there are 3 ghasts outside my nether bunker, not ok in normal mode! 

My seed is : 179081109

Please assist

Kind regards

This is a portal that i created before the update and that worked fine

Now, when i come back from the nether, it links to

900 16 343

But the original portal in my house still links to normal nether portal 105 38 39

900 16 343 links back to 105 38 39

Sophie