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By default however the posframe should appear below the current point as in your second example, so perhaps there's a configuration setting which is causing it to be offset by minus half of the character height? I'm not sure if this is the default behaviour for company-childframe as I don't use it, but for normal a regular posframe it should appear below. Looking at the code it appears that only the x-axis has any pixel offset applied.
I haven't tried this but you might be able to use posframe-arghandler to modify the default y pixel offset (see https://github.com/tumashu/posframe#set-fallback-arguments-of-posframe-show)