Mine keeps the sizes. I use Calibre to 'safely remove the device', instead of windows, from the device tab. Have you tried using that instead of windows... It should maintain the sizes as far as I can figure out. If it doesn't, try posting in the calibre library subforum which deals with library issues. It might be better served there. I find most times on the forums that it is best to choose a subforum if your issue relates to one of their headers better, and it's best to start a new issue in a new thread instead of continuing on an old one, because, the header doesn't then match the 2nd or 3rd question, which won't pique curiosity to find out what's the problem.
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