It’s possible your popcorn was old and dry. It’s also possible you didn’t use enough oil, and the heat wasn’t distributed throughout the kernels, but just concentrated on the bottom part, leading to burning.
Popcorn can and does definitely dry out. There has to be just the right amount of moisture for the kernels to pop. This is why not all corn can be used for popcorn.
A common practice is to toss a couple kernels into the oil when you think it’s about hot enough, and wait for them to pop before you toss in the rest. You need to heat the kernels quickly enough that they explode; if the oil’s too cold, they’re going to cook and get a little mushy and then the steam can just leak out without any exploding happening.
As someone who, exhausted after a long day of travel, once put hairspray on my armpits instead of spray deodorant, I know exactly how it feels to be THAT tired.