Problem with custom field after upgrade to 2.0.12

[miauczyk]

Hello
I have problem.
Before upgrade when I had created custom field for example "red" and had put a price "15 $" to it,   when I entered into my page I had such expression "red 15 $".
Now after upgrade to 2.0.12 I have " red + 15 $ " This "+" is not compatible with my page and I need to remove or modify it. But I dont know which file I can modify to remove this "+'. Please help;