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Most likely grounding issue.
The HV cage is screwed to the main chassis, so they are direct connected, the CRT is grounded via aquadag on the outside, normally via a spring touching it, can't be sure about yours not having seen it.
This assembly is normally built into the entire CRT mounting assembly, and grounded at the bottom by a metal strip that touches the main chassis.
If for some reason this does NOT make good contact, then a difference of potential can happen, which can result in unpredictable operation, so usually, when I work on a TV and the chassis is not firmly screwed in the cabinet, I always have a clip lead from the chassis to the CRT mounting assembly for extra safety.
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