You may try using MemorySetting.MEMORY_PREFERENCE while loading large files as mentioned in the following article:
You may also try to load the same CSV file into MS Excel and observe the behaviour. If it creates rows and columns more than the Excel file limit, it will raise an error in MS Excel and raise exception while using Aspose.cells as well because Aspose.Cells mimics the behaviour of MS Excel. If your issue is not resolved, please share the sample CSV file after compressing it and uploading it to some public file sharing server. Share the link here for our reference as we need to reproduce the issue here for providing further assistance.