Hi @salotembe,
Kindly please be informed that your data is not missing/lost. I could see the same in while downloading it at my end:
FYR:
Kindly please note that VERIFICACAO E ANALISE DAS NE...
tab in your xls dataset is the main dataset while group_mk2ls50
is the repeated group dataset.
Please be informed that you will need to merge the dataset through a third party software such as SPSS, STATA etc.
You could also follow the instructions outlined (to merge the dataset) that has been discussed previously:
Have a great day!