I'm not sure which drum plug-in you are using, but there are two ways to correct this.
1.) If the plug-in supports MIDI mapping, you will need to map each drum sound to the same MIDI note number the dd-65 is sending.
2.) The other way would be to assign the MIDI note number the plug-in expects to your dd-65. You can find how to do this in the manual under the Setting The MIDI Note Number section.
So for instance, if your plug in expects Tom 1 to be MIDI note number 04, you would have to make sure the pad you are hitting for Tom 1 is sending MIDI note number 04.
https://usa.yamaha.com/files/downloa...dd65_en_om.pdf