how to correct my error when i sync/phase dvs ?

hello !

last night i was at the appart, i was syncing some dvs....

then in maybe 30-40 minutes, i suddenly made "a bad BREAK DVS"(***).... coz it was not phased beats.

(*** i don't talk about pitchin up/down my turntables...)

then suddenly, my mix fallen down from 126 bpm to ~116...... (no, its not a jokes...)

so i stopped the mix and abused the Spiral FX... because i made an error and i dont wanted to cut that DVS and just wanted to let turn the other DVS, but the TOTAL mix fallen down in bpm...

is it because i'm not "soft with the touch" or because (i doubt a rekordbox issue lol) ....

it can be an 'human' issue while mixing DVS ?

how much it happened to you and how you solved this ?

Thx people...

edit: HEY !!! i REAlly FEAR it happens again,... so (while) i (will) prefer mix/sync with the pitch of the turntables.... waiting your helps..............................