mikedocy
 
Somehow, while moving around the project while editing, other clips get unknowingly selected. Then when you go to edit one clip, you unknowingly edit several clips at the same time. 
 

 
This has happened enough to me that I get really paranoid sometimes. For example, when zoomed in on a very small (apx 2 bar) zone,  somehow I must have selected a bunch of other take clips which were not visible and deleted them.  Saved every 10 minutes or so; problem was, I'd unwittingly saved the mistake. It wasn't until several versions later that I zoomed out  and saw a giant hole in my project. This has happened a few times. Don't know whether it is pilot error or a bug; at all events, the mystery of it all keeps me very wary.
 
Recently I resurrected a project created years ago in Acid Pro 7. It's all audio, and at this point basically just involves shuffling clips around. I decided to do it in Acid rather than porting it over to Sonar. Acid, while quite under-specc'd compared to Platinum, just does these bread and better things so much more easily and smoothly than Sonar, imho. 
 
 
 
 

+1 to Ctrl+S. Especially before any major changes (bounces, imports, inserts, etc.)
 
For your workflow, you may want to assign shortcuts to handy things like "restore view to previous state." Sylvan did a really nice navigation tutorial that shows not only how to assign commonly used bindings, but also how to use them.
He assigns that shortcut at around the 4m mark and uses it (which seems to be the source of your OP) at around 6:40. That entire video is worth watching if you have a moment.

Deon C recommended auto fade (+1) but you might also consider setting your Cut preferences to Delete Hole. This will save you lots of steps and it might minimize the chance of problems. In fact a single cut command would complete the task of you can live with your presets.

Either way, stay chill. We all learn through our challenges, so you seem to be learning a lot lately.

The auto crossfade regions become tiny autonomous clips, cut out of their parent clips.
More drag editing creates ever more of these tiny stand-alone cliplets all over the place.
 
Hopkinton, SPlat 64-bit.

Just another view...  if you have multiple takes it can sometimes be worthwhile opening Take Lanes just to make sure you're selecting only the desired clips.   If needed you can move the clips vertically so they're in consecutive lanes and add the fades to the "connecting" ends of the clips there.