Probably has something to do with
-grenades are less bouncy

My grenades just kill me. They don't destroy blocks either.

My grenades work just as perfect.

Mine sometimes destroy and sometimes they do not.

I think it is meant to be like that?

I know people just stand at the base and spam the grenades around.

It also might be the server connection.

Nah, I've seen people try and gren spam, Some succeed, Some don't, and it's funny when they try it too, I just shoot them and urge a votekick for the grenspam :P

-grenade world damage fix

still doesn't always work

Mine is not working , only explosion damage and no ruinning of blocks D:

Same here, sometimes it works and sometimes it doesn't.

I'll get the fix out for the next release... it's server-side ammo counts getting out of sync and only affects your last grenade. It should still hurt players though.