OK, in your query, you have three views. Datasheet view shows you what a query picked up. Design view gives you a query design grid. SQL view gives you the equivalent query in SQL format.
For whatever fields you are having trouble seeing, look at the design grid contents for that field or the SQL excerpt from the SELECT clause for that field. If there is an expression or function involved, look at it closely. Be sure that all function/expression arguments make sense.
Next, look at the table to see the record that is the recordsource for the query row giving you trouble.
Finally, if this is a single-table query, you are stuck. If this is a JOIN-based query, check that the joined elements are valid and that you are pulling the fields from the proper sides of the joins.
If you can't spot the problem, post the query here and tell us which field is the one that is eating your lunch. When you post the query, tell us a little bit about the fields that are giving you trouble. At least enough so that we know the format and what we might see in the field.