Hi!
This is not a bug. Before you can save a spell, you have to research it, im sure you knew that, you saved other spells before

. But for to be able to research the glyphs, you need to have the required level in the glyph's way.
Example: For might glyph, you need level 20 in red way to cast it, so you also have to be level 20, before you can research it.
Further, might and meteor are stand alone glyphs, if im not completely mistaken. The others, hand, humanoid and mind have to be combined with other glyphs, before they make a spell. (At least for now i think, they wont make a spell only by themselves) and they also require a high level in their specific way, before you can do something with them.
So: train your magical ways, then you can gather more knowledge of glyphs by researching them one by one, or in combination with other glyphs.