Text fields behavior with quotes and other symbols

I have a text field and I can't quite figure out when this happens, but sometimes it changes a quote (") symbol to &#65533. And sometimes if I have a lookup field, it changes it to a little square.

I can't get it to happen consistently, so I am not sure exactly the combination of things needed to make this happen. Also, these seem to be unrelated. Meaning, sometimes a quot enters just fine, other times it comes through as the &#...

Sometimes it looks up fine, and sometimes it comes through as a little square. 

Anyone know what is happening? I'm unclear so far if it only happens with the quote, or if something else triggers it.

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Mike Tamoush
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