Do humanizer tools degrade SEO quality? Noticing my optimized content is coming back differently after processing

SEO-specific concern that i haven’t seen discussed much

i optimize content carefully before sending it through a humanizer. specific keyword placements, heading structure, internal link anchor text. when the content comes back from processing, some of those optimizations have been changed. keywords moved, headings rephrased, anchor text altered.

is this a known issue with humanizer tools? are there any that preserve SEO structure while still humanizing effectively?