It is entirely possible that your pan melted a bit.
Many materials will just not warm up if you put them on an induction stove. But if you have aluminium which is thin enough, it can melt. There are people who melt alu foil on induction cooktops as a prank. I suspect that, if your pot was thin enough, or if it was layered with aluminium as the contact surface (and layered/sandwich bottoms are common in cookware), it could have heated too, and melted and fused with the cooktop.
Another way to fuse would in principle be bad enamel, if the pot itself heated enough to soften a thin layer of enamel. But this is very unlikely, since enamel has a much higher melting point than aluminium. I have used enameled pots, including cheap ones, without any problem.
This is not the only possibility, of course. As Escoce said, a burnt-on liquid can also make it stick somewhat. But if this is the case, you should be able to separate it without damaging the glass by simply pushing harder on the pot. If they are completely fused, a melted bottom is more likely.
If this is what happened, you should blame the pot, and only use pots with a "ready for induction" sign on the bottom. The only exception should be cookware for which you are sure that its bottom layer is either steel or iron. Check steel with a magnet for conductivity.