BUG: The returning index isn't equal to the inputting one

[Zeroto521]

• closes #xxxx
• whatsnew entry

as title

[codecov]

Codecov Report

Merging #651 (899b914) into main (5642393) will decrease coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #651      +/-   ##
==========================================
- Coverage   99.44%   99.28%   -0.16%     
==========================================
  Files         108      108              
  Lines        1261     1261              
  Branches      117      117              
==========================================
- Hits         1254     1252       -2     
- Misses          2        3       +1     
- Partials        5        6       +1     

Impacted Files	Coverage Δ
dtoolkit/geoaccessor/geoseries/toposimplify.py	100.00% <ø> (ø)
dtoolkit/transformer/sklearn/OneHotEncoder.py	92.30% <0.00%> (-7.70%)	⬇️

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