I'm adopted. I found my birthmother over 20 years ago. After a DNA test it shows we share 1549 centimorgans over 51 DNA segments.
Is it possible that the DNA test had inaccurate results while processing or the DNA was tainted somehow?
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Entering your shared 1549 Centimorgans into the Shared cM Project tool at DNA Painter suggests a number of possible relationships.
None of them indicate that this lady is your birthmother, but she is certainly at least a close relative.
One possibility may be that you are actually her granddaughter. That possibility would rely on her being old enough to have a child who was old enough to be your mother or father.
If you know for certain that this is your birth mother, then the results are incorrect.
DNA companies have been known to make mistakes, the data might not have got loaded correctly, etc.
I'd recommend you contact the DNA company(ies) involved and get them to recheck your sample and to ensure everything has been processed correctly.