Also, I think that some Goosebumps have endings that make NO sense

For example:

The Girl Who Cried Monster is about a girl named Lucy who finds out that her librarian Mr. Mortman is a monster, and at the end of the story... it's revealed that Lucy and her family are ALSO monsters, and her parents eat Mr. Mortman

Also, there are some villains that R.L. Stine (the creator of Goosebumps) seemed to really like writing stories for, such as:

Monster Blood from Monster Blood
The Camera from Say Cheese and Die!
Slappy The Dummy from Night of the Living Dummy (who was NOT the main antagonist of the original Night of the Living Dummy book, his brother, Mr. Wood, was the main antagonist)
The Haunted Mask from The Haunted Mask
The Horrors from One Day at HorrorLand

At this point, why not put Slappy first? He practically had a whole series made for him.