Make sure you're using our latest version v4.13.1.
PT4 Download PagePT4 should read the prize pool information from the summary files as long as it's there and the files are being imported.
If you're still seeing incorrect prize pool information please attach the original hand history and summary files for one of the tournaments where you see bad data to a
Support Ticket so that we can investigate.
By default the original hand history files will have been moved to the Processed folder, which you can access via File > Open User Data Folder in the PT4 menu.