these are not duplicate versions. They are different OS versions. The version from June 23rd is the original 7.6 update. Since then, a hotfix for NFC related issue has been pushed on 1st of July, as part of the 7.6 update. Hotfix OS versions will show the same as the version they fix in the updater (in this case 7.6), but you can see the full OS version, in About phone (in this case 7.6-20260623 for the first 7.6 version, and 7.6-20260701 for the hotfix). When you see multiple available, simply update to the latest and delete the rest.