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That data does not, in fact, appear to be text; either:

1. the protocol is not, in fact, a clear-text protocol;
2. it is a clear-text protocol, but it's encrypted, and the encrypted text is being displayed as if it were plaintext;
3. not all of the protocol is in clear text, but you're displaying the non-clear-text part as clear text;
4. the packet is being dissected by the dissector for that protocol, but it is, in fact, not traffic for that protocol;

etc..