I think that the error is related to your selectors. Since you are on level 3 RPA developer course I assume you are using Reframework for the task and I believe because of the exceptional error handling capabilities of this template your application just moves on with the next item instead of crashing when it can't find the element.
To solve the selector issue you can try the following:
- Use partial selectors instead of full selectors
- Use wildcards for dynamic parts of your selectors (* for replacing any number of characters, ? for replacing exactly 1 character)
you need to remember the fact if you have used basic recorder functionality of UI path it generates full selectors.