I've noticed that if you revise a homebrew spell that has been shared with the community and share the new version, its rating (+ / -) reverts to 0. I think this is problematic, because it doesn't encourage corrections and improvements for DMs and players that share their homebrew. I had a homebrew spell that had a rating of +5 after many months. Not knowing the rating would revert to 0, I edited it for some minor corrections. I was disappointed to see its rating drop back to 0. 

I understand that a revised spell might be very different from the original one, but I think ratings should be cumulative from version to the other (keeping both the positive and the negative ratings from previous versions). 

People can see the ratings of the previous versions but I think the spell should definitely reset to 0 because what people up or down voted for may no longer be relevant which means it could be giving an inaccurate view of the current homebrew.

If it worked the way you request: Let's say you made a spell that sucked. It went to -5. You revised the spell, it's now much much better -- but still shows -5 putting people off from looking at it further.

Whereas currently, if you revised your -5 spell, it goes back to 0, so it'll get more people taking a look at it and that means more people might be willing to add it, use it and upvote it.

The "current votes" should reflect what people think of the "current homebrew". When perusing homebrew, those views, adds and votes give me a good indication so I can hone in on the ones more likely to be well made. I don't want to find an upvoted homebrew only to find those votes are for previous editions that are not what I'm adding. This makes the votes unreliable - and its not as if they're the best indicators as it is, so for them to become even less reliable just makes the whole voting system a waste of time and more of a detriment than an aid.

I understand this point of view. I admit I was mostly thinking of times you make corrections to already positively rated homebrew, not corrections to negative ones. I still think the current system discourages corrections. I see homebrew with a great number of positive votes that would definitely benefit from certain corrections (typos, incorrect tags, or somewhat convoluted spell descriptions), but their creators might never make these-- often minor-- corrections for fear of losing the homebrew's current value. 

Alas, unless there are  "current rating" and "cumulative rating" columns, I don't think there is a good solution.