Tar. Why does it vary so much from stick to stick?

[Thrak]

I had a DPG Blue today. I've had many of these before. This one however had SOO MUCH TAR coming out that I had to stop and get a paper towel to wipe it out. I used a punch, like I usually do, and cant remember any other cigar being this bad. It was kinda gross!! lol... I'm just glad it never hit my tongue!

BUT, why do some cigars have a lot of tar seep out, and some seemingly have none? Especially in the same line, I find this odd...

After a wipe and purge it was back to being tasty though.