The Weirdest Thing

i recorded several vocal tracks... i mixed it a little before going to lunch.. i came back to do more mixing and i didn't see one of my back up tracks.. i searched the audio data folder but no luck, i guess because i saved as bundle file, anyways i had came to the conclusion that i never recorded the back up track or i had deleted by mistake.. when all sudden i hear a vocal where i didn't see any wav but the instrumental.. i muted and solod tracks and i couldn't understand how i muted every single track yet i heard a vocal.. i highlighted all tracks and click BOUNCE TO TRACK and i see the missing track.. i looked even more and i saw track 5 was missing.. now you know that if you move a track up or down no matter what the sequence will be 1,2,3,4,5,6,7,8 etc.. so check out the screen shot i took of the session

can anyone tell me what they think is going on here?

thanks for your time.

thanks allot i don't know how it was placed as hidden, thanks again i appreciate it