Right. I had a wrong setup: Common Options / Look & Feel / Base font size = 1.0pt instead of the default 0.0pt.
I did one more test:
(1) Convert an original EPUB to AZW3 with this base font size set to 0.0 => text size = OK.
(2) Convert an original EPUB to AZW3 with this base font size set to 1.0 => text size = small.
(3) Convert the AZW3 from (2) to AZW3 with the settings following the wizard / Use default values (i.e. base font = 16.0pt and font size keys = 12.0, 12.0, 14.0, 16.0, 18.0, 20.0, 22.0, 24.0) => text size OK, same as with (1) directly.
This is consistent.
I thank all of you guys that helped me with this.
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