I'll just describe how to create the problem:

- Open a new Writer Document
- Type: "1. Hello world"
- Press Return 
Writer will recognise that you are typing a numbered list, indent the line you 
just typed, indent the next line, and give you the next number in the list.
I don't want a numbered list, so i 
- Press Ctrl + Z to undo the AutoFormat
I also want a line's gap between the line with the number and the next paragraph
- Press Return
Writer will recognise that you are typing a numbered list, *Again*, indent the 
line you just typed, indent the next line, and give you the next number in the 
list, and place the cursor on the line after that, so if you want to type on the 
numbered line it just created, you have to press up or click the mouse in the 
appropriate place.

Writer should have realised that by getting rid of the first autoformat, i 
didn't want it and shouldn't have tried to do it again.

This is hardly critical, just quite irritating.

I'm skeptical as to whether the auto-indent when you press return with the 
cursor below a line with a number is even a desirable/useful feature.