Sometimes this transitioning process can be a bit more arduous. In some cases the issues are a result of variations in how the seeds were created / stored. This is what prompted me to push the onboarding work.
Your best resource is probably this FAQ written by community member Winston: https://matthewwinstonjohnson.gitbooks.io/iota-guide-and-faq/getting-started/guide-transition.html
If that isn’t working you can get help on Slack (see slack.iota.org), particularly in the #help and #light-wallet groups.
Don’t worry. Your tokens are safe.