I mainly use Deviantart site and I've use it for many years, and I draw and show many arts, but lately Deviantart assign some of my arts are mature art and add the mature tag and I can't remove it, and I notice it reach to some of very old arts, but I feel I don't draw the mature arts. these 4 arts are some of them.

https://www.weasyl.com/~nekomarunosuke/submissions/2086952/inami-colored-pencil-practice-1
https://www.weasyl.com/~nekomarunosuke/submissions/2135412/inami-green-forest-1

https://www.weasyl.com/~nekomarunosuke/submissions/2139728/inami-mountain-river-1
https://www.weasyl.com/~nekomarunosuke/submissions/1960139/inami-witch-brilliant-sun

the first two arts is swimsuits arts but I don't think it's not mature, and last 2 arts aren't mature at all, but all of them are assigned as mature arts, I think it's mysterious.