The chunks are precipitation out of the products of reactions among fertilizer components. The stuff you need isn't all there any more, since it has reacted chemically and fallen out of solution. Your plants will react unpredictably to it, and you can damage them. Shaking the chunks does not re-solubilize them, it just makes them smaller. They are no longer the chemical that the manufacturer originally put into the bottle!!!
A properly chelated fertilizer system should not have that problem.

Throw them away.