I have an open call with support about this issue but wanted to see anyone else was experiencing this problem.
I noticed after the latest update that whenever I export a report in an XLS format with a certain number of attributes selected that a number of spreadsheets fields are incomplete with information. This only happens with the XLS format. The information is complete with all other export formats.
Unclear on the turnaround for this problem but this makes that export selection useless to me. My workaround so far is to just select the csv option until they fix the problem.