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Yep. The JVC menus are often rather 'sketchy' in terms of strict compliance with video standards, this isn't unusual.
They often use a very (very) crude sync' structure (often just a -140IRE period followed by a burst) which is 'good enough' to be reproduced wholly by a television set but not intelligible to capture hardware or low-quality TBCs that time-sync the line but do not replace the faulty horizontal sync information.
It's just a symptom of this crude way of showing the menus, televisions are more immune to this as the local oscillators will lock to this 'crude' horizontal period, and some digital equipment is looking for something a bit more intelligible.
At least that's what I understand it to be, I think some computer game units used a similar trick and cause similar confusion to some equipment.
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