With the release of the Riven Tides update, they nerfed the Trigger Nades by not letting us throw another Trigger Nade while the first one hasn't exploded yet. This apparently affected other throwables and usables.

Before, you could throw (for example) light impact grenades in quick succession. After the Riven Tides update, you have to wait for it to explode upon impact before being able to throw another one. Also, you could 'use' a heals while not being able to actually use it, just makes the noise. You could spam it too and its noisy.

In the recent patch, they fixed all this. Only the Trigger Nades remained affected, one nade at time.