Sneak Ignoring Marked cue

Sat in a cue where a moving fixture marks. Fixture has home values stored in the cue (First cue it is used in in the cue list). If I change any parameter of the fixture and then sneak it back to the cue it goes to the home values rather than the marking value with no indication that this has happened (channel display shows mark correctly but the fixture is not at that position). Have to assert the cue list to get it back to the correct values. Seems to only be an issue in this specific cue. Happening across multiple different fixture types. Any ideas why this is happening?

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