You may have just gotten what's called a "hot nug". I grew cannabis before getting HPPD and switched over to hemp flower once I realized I had it. When growing cannabis you can never be sure about the THC content of every bud on a plant. Sure, a good majority of a harvest might test out at .3% THC (the legal federal limit) but it's impossible to test every single bud. If you're going to continue using CBD/hemp flower I'd suggest buying it from a reputable source where you can view their certificate of testing for anything that you buy. I personally only buy from an online place called Tweedle Farms. They're total THC compliant and I've never gotten a "hot nug" from them. Not saying it's impossible, but if you buy it from reputable places it will definitely be hard to come across a high-THC nug. I love hemp flower as a replacement for regular weed so I get the impulse to use it, just make sure you're aware of any flareups it could cause & that you don't get it from a sketchy place.
