I have come across 4 that happen to me fairly often, not game breaking but def a big annoyance especially when not prepared for it to happen while in an intense battle (especially while playing Soldier Class). How many of you have had any of these 4 problems that I have encountered and what are your thoughts and experiances? Oh and I am on PS3, so please add your platform if you have had experiances that differ.
1- The Phantom Grenade - Simply put, you go to throw a grenade and well nothing happens at all. It gets thrown but I guess hits that magic 88mph mid air and it activates the internal flux capacitor sending it to another time (Maybe it was that magic grenade that killed you at the start of a match in COD4 3 years ago?).
2- The Molotov That Never Was - Well this one is easy to work around if your on your toes, it happens after you throw a fresh molotov, your molotov meter will say you still have one to use but when you go to use it, it seems like its working well enough until you release it and it dissappears mid air. Problem comes with the fact that the meter for the molotov wont refill until after you throw the second (fake) one that it says you HAVE.
3- The Wait, But I Didn’t Mean To… - This one pisses me off the most of them all as it has caused me to kill myself more then once. In this glitch you press the grenade button and well it seems as if nothing happens at all, must have just not registered me hitting the button, right? Then you release to press again and a grenade or molotov launches out as you pull one back to throw which ends up being a dud.
4- The I Swear It’s Usually Bigger! - This one is for those who have upgraded grenades, it happens seemingly without pattern and sometimes hard to pick up. What happens is you chuck out one of your Macho Man hairy chested upgraded Soldier grenades and it ends up being a Topher Grace tryin to play Venom pussy grenade. I love announcing over my mic that I have a fresh upgraded grenade ready to clear an objective or room and chuck it in and run only to have it do a little poof in the crowd and knock over 2 people.
Again doesnt ruin the game but def one of my biggest annoyances thus far regarding gameplay glitches. Another one goin on with guns shooting/reloading getting slightly mixed up when doin multiple actions at once but havnt encountered it enough to really get down the whole process that happens and what exactly I might be doing to cause it.

I have noticed since the last patch that the nades have a glitch just like you mention.