I create events on my laptop but when I view them on iPhone all the text in the description section turns to code. I have figured out to not cut and paste, but even if I type in the details it changes ONLY on my phone.
Based on the information given, I would try to re-sync everything from scratch. Re-install google calendar on your phone (it will be an icon on your home page).
If you need more instructions on how to do this, please let me know and I will assist!