Welcome. Yep, seems hard to believe that it's after TDC. Are you misinterpreting the data? Perhaps it displays BTDC as negative and after TDC as positive numbers. From an engineering point of view, that would make sense, but it's contrary to old school mechanics.
Check the instructions or contact the mfr to verify. my opinion is that it's fine, and negative numbers are BTDC.
George
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"...out to my ol'55, I pulled away slowly, feeling so holy, god knows i was feeling alive"....written by Tom Wait from the Eagles' Live From The Forum
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