My image links always ended with "?337637"

I don’t know what’s happening with my site, this is happen in all of my posts..

Take an example of this post: https://resepkoki.co/resep-ayam-goreng-pilihan/

All image links is ended with “?337637”, then I double check my post in my dashboard, the link is fine (without “?337637”)..

Any advice how to fix it?

Thanks