Low content ebook book - I need an expert in kindle ebook upload and appropriate software

I need an expert in kindle ebook uploads to trouble shoot why my low content manuscript isn’t uploading in the right position on kdp. I have used jpeg images (created through Canva) throughout a word doc and it is repositioning during the upload period to kdp to a small image to the left of the page instead of sitting in center (see attached images). The centred image is in word and the off-center image is when it has been uploaded to kindle. The pages are set to 7 x 10 inches but it’s the same when I try 6 x 9. Help! I have read Calibre is a good tool to work with but I really need someone who is experienced in the upload of kindle ebooks and can guide me on formatting, software and deliver the manuscript back to me in a way that is optimal. There are only 5 pages of differing content as it is a low content book so the job won’t be extensive and anyone who knows what they are doing should have no problems with it.