Saving SVG files in Illustrator CC 2015.3, on reopen pen points have moved.

hi there! have been having problem quite awhile illustrator. work icons built pen tool , save them svg files. once save them first time close them , on reopening them find pen points have moved , icons distorted quite bit. have on 100 icons i'm working , it's annoying keeps happening. if locked layers once i've completed design? don't see solution though may need edit icons later , unlocking layers time wasted.

 

any advice appreciated! thanks!

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