extra frame showing in main comp but not in the precomp
I've made a precomp with some footage that I've dropped into my main comp. In the main comp an additional frame that has been cut in the precomp appears at about 60% opacity. When I view the precomp all is fine. It only appears in the main comp. If I try to cut out the extra frame from the precomp in the main comp it then glitches worse in another area again showing frames that have been cut at a lower opacity on top of the footage. Frame rates are the same between comps. I've cleaned my cache. I've never encountered this before so I'm not sure how to reproduce. What could be causing this?
AE 23.6 / Mac Ventura 13.2
Here's the main comp –

Same frame in the precomp –
