The issue is that the 750x1182 version has bookmarks / a table of contents (toc) entry for every page (see attached). By default, k2pdfopt starts a new conversion page for each new page in the table of contents. To disable this, add -bp-- in the "additional options". I'm guessing your 650x1025 source file did not have bookmarks / toc.
This is why it is so important to post the source file. I could not have easily diagnosed this without seeing your source file.
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