Welcome!
Yes, your blade could be dull or loose or too tight...or maybe you're not putting enough pressure! The blade needs to be tight enough not to wobble, yet loose enough to turn easily when you roll it along your cutting mat. One of my friends was having trouble just the other night with her rotary cutter skipping. I checked to make sure it was not nicked or too loose or too tight, as she said she had recently replaced the blade, then did a test cut myself & it worked fine. We decided she just wasn't pushing down quite hard enough! Sometimes it is the simplest solution! :D
Good luck!
sue