Hi Alexander,
I moved to new version 26.5 and here my results:
Please see:
Comparison(left-Csv, right-MapInfoTab)
image.png (112.0 KB)
Test data(input/output/QGIS)
5320-Csv-MapInfoTab.zip (44.9 KB)
Thanks,...looked at the CSV → MapInfo Tab conversion you performed with...MapInfo Tab version – Some GIS tools expect a specific TAB version...