The same thing happened to me using Safale 05 on a Pliny the Toddler. It did not smell off, so I racked to secondary. I wouln't worry.
I brewed a pale today and racked onto this same yeast cake. WOW. Bubbling in 1 hour with a Violent blowoff in 2 hours. My Fermentation fridge is fighting to get the temp down. Ambient in fridge is 61º. Carboy is 71º 5 hours later.
Amazing stuff that 05.
Primary:Black Friday Pale
Bottled: Founder's Breakfast Stout, Preto Branco (Black Orchard clone)
Kegged:Brown, WCIPA, orange cascade, Amber, Vanilla Porter
On Deck: APA, RyeIPA, Kolsch