Instrument tracks scambbled after reloading project!

Hello...
 
My latest project was botched after I loaded it up and all my instrument tracks were scrambled...
The MIDI clips remained on the same track but the instrument itself moved elsewhere.
What was Komplete Kontrol (Piano), is now Session Drummer so, the MIDI clip on that track with my piano notes are now triggering Session Drummer.
 
The instrument plugins I used were Komplete Kontrol & Session Drummer.
 
This is another level of SONAR nightmare for me; it nuked my project! I can't even...!
 
Don't know if this would happen to me again but if anyone knows anything about it, please let me know!