We have the Itouch version and I've had this happen a few times and this time just cost me $650 so im a tad annoyed.

There are 4 slots to hold things, I purchased the "unknown chemical" then decided to purchase the growth hormome to get babies old and sold so I had room to move fish around to use the chemical. Well i looked up and the darn growth hormone had taken the place of my chemical. Thats just not right, there are 2 open spots that it should have went into leaving my chemical to use when i wanted. Now i have spent 650 and have nothing to use ;o(((

The other thing I have found on this version (not played the other versions) is if you purchase meds which are 3 doses, use 1 dose find its the wrong thing, buy the other it replaces your 1st med so you lose 2 doses.

This shouldn't happen they are paid for they should go into empty slots.

So is this a bug with the iphone version or is it the way it should work?
Marcy