When typing my mac keeps highlighting and deleting stuff or it jumps back into an old word and starts typing in the middle of it  what is going on??

When typing my mac will highlight words and totally delete them or it will jump back into something I already typed and start typing in the middle of that word... just started doing this about three weeks ago.  Any idea what is up???

Found the problem! Very weird!
http://forums.macrumors.com/showthread.php?t=1157103
http://ask.metafilter.com/145408/The-cursor-on-my-MacBook-jumps-around-like-craz y
Wow! I would have never thought to look at the battery! This problem started for me after I closed the lid of my '08 MacBook Pro last night. This morning when opened ithe lid (which seemed a little difficult) and I started typing the problem was there. I read a bunch of similar threads but nothing helped (Tap to Click...). Then I saw the above from Macrumors and looked at my battery. One side is slightly bulging and is putting pressure on the trackpad bar from below. I can avoid the problem by typing with my hands off the surface of the Mac, suspended above the keyboard, but the battery needs replacing I guess. It must have overheated when I closed the lid last night, though it should have slept properly, sometimes Chrome or Flash running in Chrome won't let it sleep. I usually just manually 'sleep' it from the Apple menu without closing the lid.
Side note:
I just had the whole MacBook refurbished by Apple for $300 a year or so ago, but they didn't change the battery then. Still a great deal...new display, logic board, display board, ram... I swapped the original 200GB HDD for a larger hard disk (750GB) from iFixit. It's been running great ever since but I have noticed some laggy text entry recently or since switching to Mavericks...maybe related to the battery starting to fail.

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