Apps not retaining settings

[Guest Irwell]

Hi everyone. I'm a new Galaxy S user and have a few apps installed, but haven't rooted my phone or anything like that. For some reason a number of my apps save their settings for a short period of time, but revert back to the default again a minute or two later. I tried following some other instructions I found that suggested going into recovery mode but this doesn't appear to work on my phone. Does anyone have any ideas what the problem might be and how it can be fixed?