Hi There,
While converting from PDF to XLS, I found that columns are merging if the space between column is too small.
While going through the forum topics I found this topic ( Column data merged when converting PDF to XLS when space between columns is too small ) and in that you have mentioned that this issue is fixed in 9.9.0.0.
I am using the latest version (9.9.0.0) ASPOSE.PDF and still I can see this issue. Please find the the PDF file and XLS file for your reference.