Figures in my *.dvi file are numberred as 1, 2, 3, 5, 7 ...

(ie., Figures shown in dvi file are Fig. 1 -> Fig. 3, then Fig. 5, Fig. 7 without Fig. 4 and Fig. 6)
Please teach me more.
Thanks alot.
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NEW: TikZ book now 40% off at Amazon.com for a short time.
And: Currently, Packt sells ebooks for $4.99 each if you buy 5 of their over 1000 ebooks. If you choose only a single one, $9.99. How about combining 3 LaTeX books with Python, gnuplot, mathplotlib, Matlab, ChatGPT or other AI books? Epub and PDF. Bundle (3 books, add more for higher discount): https://packt.link/MDH5p