The graphic I’ve added to this post is to make a point in regards to writing rules; sometimes its not a rule at all but more of a guideline.
There are almost 600 exceptions to the ‘I after e, except after c’ rule, thereby not being a rule at all. Besides, as any good writer understands, you would learn the rule to know when to break it anyway.
Or check out the explanation with the BBC show Q.I.:
Brian Regan also explains with hilarity the confusion.