genetics - Why are some SNPs assigned to the wrong position or even chromsome -

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when lifting genome wide data came across issue, rs-numbers have merged. leads me point, snp must have been misassigned wrong position once (or wrong chromosome). after time, laboratories must have realized mistake , corrected it. in case old rs-number retracted , "old" rs number used snp. ok, far good. question concerns question, technical issues or problems can cause such misaligment:

which can technical reasons, snp assigned wrong position (or chromosome)? how possible @ all?

see:

https://en.wikipedia.org/wiki/dbsnp#release

see question, plus ones follow in same section:

http://www.ncbi.nlm.nih.gov/books/nbk44417/#content.i_heard_that_rs_numbers_are_not

and this:

https://www.biostars.org/p/8040/


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