You did not upload or convert your file to "Kindle", you uploaded to
Amazon in order to get it converted to
MOBI + AZW3.
calibre does not and has never tried to cater to ebookstores, it caters to users.
Epubcheck is one example of a program that complains about a lot of things that aren't really problems, but which will cause a store to reject an upload. calibre doesn't care -- what matters is it looks good on peoples' devices.
...
MobileRead does actually have a subforum for authors and publishers looking for help in validating and uploading to bookstores,
but calibre isn't it.
Try the Workshop or the EPUB subforums listed here:
https://www.mobileread.com/forums/forumdisplay.php?f=177
If you have a book that doesn't look the way you expected it to look after a conversion, and you aren't asking for Epubcheck validation, then feel free to continue this conversation here -- but as Kovid said, you cannot really expect any help, entitled, free, volunteer, or otherwise, if you don't provide us a way of seeing what you are seeing.
Which means an input file which displays the problem, at a minimum.
...
An attitude readjustment wouldn't hurt either, if you want people to want to help you.
No one is interested in your melodramatic Dementor experience
or your passive-aggressive disappointment in your paid calibre support that you didn't pay for.