Issue with importing to checkbox type fields where label is the same as database value (may affect other types too)
Importing to checkbox type fields currently has some problems. This bug was originally reported here in 2015: https://issues.civicrm.org/jira/browse/CRM-17493
There is a pull request with code that seems to fix the problem: https://github.com/civicrm/civicrm-core/pull/9393
There were doubts about whether the code in question is still used in the latest CiviCRM versions. I can confirm that when importing contributions from a CSV file into CiviCRM 5.10.4, I ran into this bug. The code in the pull request fixed the problem.