VBA code behaving differently when stepping

I am trying to write code that will handle the "change" event of any ComboBox on my userform.

I went by this question's answer and created a separate class, etc.

However, it doesn't work. Using the same code on a new project works fine, this code on this project works sometimes when I use the "step by step" execution (F8), but when using normal running it doesn't.

Looking at other people's similar predicaments I added "DoEvents" but that didn't help.

This is my code in the UserForm

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And the class module, named "ComboBox_Class":

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EDIT:

I was answered on StackExchange - I needed to make the Collection variable public. I just moved it from the UserFrom to the Module and declared it Public.

Without having a sample workbook to test, I'm going to try to take a stab at it. I'm not sure that this is even the issue, but, in the link they have there Collection declaration before the sub title. So, instead of

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Should it be

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If that doesn't work, can you attach a sample of your Userform and code?

No problem, glad you were able to get it working.