UserForm Initialization does not load items in ComboBox, Option values won't transfer etc.

I'm building a Lessons Learned Database that employs several different dropdown lists, most work, but the .additem method does not. Additionally the Category and SubCategory values will not transfer correctly to the spreadsheet - totally perplexed why. The UserForm1_Initialize function does not work and I can't figure that out either. The navigation is controlled primarily through the scrollbar value. I've attached the spreadsheet and commented within the code where issues are. Any help is deeply appreciated.

That was a huge help - I couldn't see the forest for the trees! Thanks. Now that allowed me to further test the form and the Option Box values are correctly being placed however the "Next", "New" buttons are not working as planned. The records are not incrementing - I'm using the scrollbar value to increment them and it appears from my point that they should. Help?

Roger that - Thanks again.