modified shifting

saqc/funcs/rolling.py

@@ -218,7 +218,7 @@ def _hroll(
     f_out = pd.Series(np.nan, index=data[field].to_pandas().index)
     f_out[window - 1 :] = f_result
     if center:
-        f_out = f_out.shift(-window // 2)
+        f_out = f_out.shift(-int(np.floor(window / 2)))
 
     for f in target:
         data[f] = d_out