Left shift key is stuck after cleaning?

I recently had to clean my left shift key because it was sticking so badly, no other keys had the problem so I carefully took off the key cap and plastic doohickies as per a video.  I cleaned the back of the key and a little around where it sets.  After I put everything back the shift key is now locked.  I can only type in capitals etc.  Have checked caps lock and stick button in systems but to no avail.  I restarted the computer and now it has booted in safe mode.
Please help!
cjk

Did you double check to make sure you replaced the shift key correctly?

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