Board Thread:Questions and Answers/@comment-11633536-20130706223051/@comment-5079138-20130709224852

It's a bug. You should try downloading Big plants fan's Plants vs. Zombies "Cool Mod" here:

www.mediafire.com/?gcbg1xqbhpir6by

OR

You can download Minh's PvZCC mod here

www.mediafire.com/download/mlbkj6sfatuwv60/PvZCC+Mod.zip

I know they are modded version of the game but I'm pretty sure that creating a new profile in these mods can fix  the problem. Don't use the free Haloween mod because it will cause Zomboss glitch.