Flash of bright colour/light at start of clip

Hey everyone,

I've recently started noticing a bright burst of colour or light at the begining of every clip after a cross dissolve, film disolve, dip to black transition. These transitions arent attached to the next clip theyre just on the end of the previous clip. It happens to every clip after a transtion clip.  I've made sure my colour grade adjustment layers arnt overlapping anywhere.. everything looks perfect but it just keeps happenning. Its a very quick thing that happens but  canr hepl but notice it every time now and I'm doing wedding videos so its really not ideal. 

Hopefully I've explained this well enough so you can understand what I'm dealing with.

Just let me know if anyone has dealt with this before and how you fixed it. If you need any more info, just let me know. 

Things that might help to find the answer: I've just pruchased a new macbook pro M2, thats what I'm using and have noticed it since using this laoptop.

You can see below I've attached a screenshot of the clip I've attached - the transition and the colourgrade are not affecting the start of the next clip.. but it only happens after a trtansition clip.

 I have also uploaded a snippet from the video here to show you - I feel this is the easiest thing to do rather than explaining something like this.

Any help would be appreciated 🙂