Yep I've had that same problem and I lost many matches because of this.during a tour final against earthworm my chesto rest kingdra switched into toxic spikes, which activated the berry (like lum).
(21:26) Smurf.: hey crystal i have a glitch to report
(21:27) Smurf.: about chesto berry
(21:27) Crystal Moogle: Activates on toxic spikes?
(21:27) Smurf.: yeah
(21:27) Crystal Moogle: Ok, I thought it was fixed... I'll check up on it