on-screen Keyboard changed font

[Simpdapimp]

For some unknown reason yesterday after work my phone complete froze, and would remain unresponsive for about 30 mins or so but in that time i soft-reset the phone over and over and over and eventually after removing the battery then returning after a few mins and a soft-reset the phone decided to come back, so when i went to reply to the 50 text messages i had i noticed that the phone of my letters on my on-screen keyboard had changed and looked more like a courier font instead of the normal but if i do caps look they look the same. when i type they still show the same in the text message screen but the keyboard itself look to have changed fonts. I have not installed any software in the past week or two so i dont think it could be any software. Anyone else have this happen to them, or know what could have caused this? I have the Stock Touch Pro rom that was delivered with my phone. this is the first itme i've had a major problem with it freezing up like this.