Why are klonopins different sizes and textures?

the first 3 months I was on them they were very powdery and would melt in my moth before I could swallow them, then the ones I've gotten since then are thinner and don't melt, and they're kind of grainy. What's up with that?
Update: Qualitest Pharmaceuticals Inc. supplied my first three months at the hospital pharamcy these were .5mg round yellow with a V on the front and 2530 on the back. The Ones I get from Rite-Aid are Supplied by Teva Pharmaceuticals USA.
Update 2: also .5mg round yellow but with 93 832 on one side and perferated on the other.
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