i agree with you. its still a bit confusing if people are resubmitting a completely different entry halfway through the entry period imo. especially when it happens again every single battle. i wonder why, because i dont understand why you upload the first versions at all if you very likely do another one and replace it.
there are cases where its useful, for example when you upload an illegal entry of course or notice a small mistake, but in this case it's just confusing for everyone. idk if "unfair", like midori said, is the best word to describe it, but still... if i see a new entry i tend to listen to it / look at it and already form an opinion on it. especially if i liked the orginal idea, a completely different resubmit is just straight up disappointing.
edit: its not a big deal if it happens one time. but this is ... the 4th time yomaru did this on an entry and i slowly start to not even try to like something he is doing because i feel like its useless if he replace it with something else anyway (this entry for example how it is right now looks very cool imo, i like it. but why should i even bother, when theres a big chance that he will upload something else next week? :/)