08-03-2017 01:23 PM
Welcome to the Community Forums.
As the Ideapad 310 is not only the ones that have this different layout that is a definite challenge amongst typist and coders, Yoga 710 users find a better workaround with key mapping as discussed here.
If the right shift key works fine but singularly pressing left shift would also do a page up then it would be better to call in technical support for possible repair.
Hope this help answer your other query.