I tried to download data that appealed in Kobo but variables came empty

I changed the version of the Kobo survey by doing modification on two variables, and I am now unables to access the data on those two variables before I made changes of those two variables. When I tried to download data, they come without data. any tips

Welcome to the community, @dalbert11! This support article Recovering Data From Previous Form Versions should help you solve your issue.