Hi @rma123 ,
yeah, without seeing the workflow and the data you're using it's impossible for us to know.
If you input a file and it contains 10 columns, then you input another and it has 8 of those columns, you will be left with those two highlighted as missing in orange. If you deselect those, then it won't load them in next time as you have specifically told it not to.
If you ensure the "Unknown" field is checked, then load the one with 8 columns in first, then when you load the one with 10 columns in it will pick those up automatically.
Your screenshot doesn't show us anything.