Could be, but it could be from when you joined the two glasses they were different temperatures and you froze the ripples. Make sure you work the join better and keep aware that colored glass will move differently than the clear glass (and opaques will move differently than the transparents).
One tricky bit with marbles is that you're moving glass on the outside, but if you don't have the glass under it hot enough it won't move along in a harmonious way. Think of it like tectonic plates, they move independently of the core of the planet, but not always quietly.
You can heat the outside of the glass all you want, but if you don't heat the glass under it, you'll have issues in shaping and getting a clean surface. This is where building a good heatbase by going in and out of the flame to let it soak all the way to the core can be crucial. If you maintain that heatbase, you'll shape more efficiently too.
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-Tom
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