prims acting funny

I haven't really been building a lot recently but I've worked on a few things now. Prims are just doing strange things. Examples, I was trying to move/size a prim that I had linked with other prims. Of course, I used edit linked part. and it won't let me. I checked to see if somehow I got the select textures seclected and that won't it. When I would try moving it even throw off 4 other prims I was not moving. That's one problem I've been having. Another one I've been having is I've also been working on a prim in an area I know I could (ie. my property or a friend's) and next thing I know an object gets returned to me. Anyone else having these problems? This is really making me dislike building. I don't like having to unlink everything. Nor, do I like stuff being returned when I can know I can have it out and I know there is enough prims on the land. Makes me wanna pull out all my hair if it was long enough for me to grab.