Sounds like you were burning patches, for sure. That is one of the tips new shooters are either fortunate to learn from a mentor, or don't learn until they are ready to wrap the gun barrel around a tree! You have to read your patches, even if you also use a chronograph to work up loads.
I have had the privilege to help new shooters find and read their patches, and teach them what the patches tell them, on many occasions, and the shooters are always forever grateful, whenever they see me again, for the education I gave them on reading patches. They become firm believers, and practicioners. I even get calls at home from some of them who are seeing something different, and want to consult me to find out what it is and what it means, or at least confirm their own readings. Sometimes they are helping a relative or other new shooter.
Whether a patch burns depends on the powder used, and the thickness of the patch, and, frankly, on the kind and amount of lube used on the patch.