Chunk Re, and Un-Populating

So i was running around my Survival World Filling out maps, i got in a boat and left my mule tied to a fence post (Screenshot taken for coords just in case), Then i starting filling the water portion of my map

1st Game freezes for 3 seconds the un freezes with 10 Mobs right in front of me

I had to loop back around because i missed a spot on my map, when i was done I took a shortcut through a river (Same River in pic 2) and i notice my map start up dating and clearing out trees

2nd Weird area with not vegetation (3 shots)

3rd started walking around, found another updating area on the map

Turned on fraps for a quick capture
_nope

So i finished worrying about the chunks derping around and i went back to the beach i lisft my donkey on and...

4th Donkey & post gone

I even teleported to the coords just in case

Thanks for reading, and thanks in advance for fixing