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It's standard speak in the space industry, not marketing.

Not at all. It is neutrally called anomaly, so that there's no premature explanation out there that would be difficult to correct later if proven wrong. NASA had that problem once and that's why it is done like that today.

Edit: Here's an example search (excluding SpaceX): https://www.google.de/search?q=anomaly+rocket+launch+-spacex

Just space flight technical jargon:

Nominal - as expected (no more than nominal deviations from expected parameters)

Anomaly - something unexpected

Performed nominally. Performance anomaly.

Not sure which I overheard.

You would never say 'nominally', rather just 'nominal' to avoid confusion on noisy radio nets.