That is a totally normal on this site.
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And for me, letting anyone to "steal" or reposting your creation is not a colossal problem.
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That is because when they receive a point from upvote, you can get an upvote points that is twice from the reuploader's upvote points. It is like a mutualism which is both sides are benefitted but the original creator receive even more benefit
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And anyway, my creation is literally free for all and free to use, credits are just optional.

@5 Yea he’s a f*king 6 year old “Jamie and Colby” is probably cocomelon.

Yup. From the site rules:

Tweaking airplanes is okay

It is okay to download someone else's airplane, make some tweaks, and re-upload a new variation.

In fact, the original designer may even receive bonus points.

However, if your variation does not offer any improvements over the existing airplane, then it may be removed.

If you are circumventing the predecessor/successor system, then you will be banned. Never upload a successor as an original design; give credit to the designer of its predecessor.

If you'd really rather not have people do that, you should add something in your biography page like "If you want to upload a modified version of one of my planes, ask for permission first".

@5 oh so that's why I got redirected

Let's just report it and move on, no need to swear here, okay?

He got banned already