I guess that the lack of proof explains the varying degrees of belief and inconsistency of a solid "flat earth stance". Similar to religions though who manage to break away into sects and variations over any small interpretation of [insert fictional word of god here].
Round earth has a wealth of mutually supporting evidence hence why the position is standardised. FE has no such luxury, unless it is being kept a big secret because I have read none of it so far in my exploration of it.
I do admire the "challenge everything" attitude of FE, indeed it is the basis of all science to challenge what we think we know. Where it seems to fall down when compared to science is in the lack of accepting scientific proofs when they are given.