HELP.. mybb1.6 became 1.8?

[.m.]

provided access has restrictions and can't check whether the issues are completely fixed.

updating templates is a time consuming process and you can follow below guidance

Visit your Admin Control Panel, then go to Templates & Style > Templates > Find Updated Templates.
This will show you a list of all the templates that have changed during the upgrade.

You can either revert these templates to their default - meaning all the changes you've made to it will be removed
- or you can see a Diff Report which will show you exactly what's changed. If you have a custom theme installed,
it is probably best that you look at the Diff Report and apply the changes you need.