you've just described exactly the same experience which happens to me quite often. I must say that I'm quite relieved that I'm not the only one like that. thank you for taking time to write this
what you say makes sense to me. I too doubt that by some chance Buddhism teachings turned out to be better preserved throughout millenia then any other "very old teachings" whatever it may be - Christianity or something else. Any information has the tendency to be misrepresented.