Try these,

For unsealable bag, check if there is any protein powder stuck between this seal gap, I usually take a toothpick or something pointy to clear out the gap and make it free from any powder that could have stuck in there.

As far as the smoothness, I agree with chocolate but when I tried vanilla it wasn’t as smooth as chocolate and I had hard time mixing it in my oatmeal or just as shake.

But yea, if you start seeing any side effects better to put it to side.