EXR clip has flickering blue overlay

I have an clean plate EXR clip where I noticed that once I set the Alpha Fill to transparent, seems to show the most of the frames correctly, when roto’d onto another clip, but I saw that a few frames were actually just showing the clean plate clip, but ignoring the roto even though I had Alpha Fill Transparent set on the clip. I was able to correct it by setting Alpha Fill to NONE and then set it back to TRANSPARENT and now the clip was obeying the roto shape. But this seems like some type of glitch, since I had to toggle TRANSPARENT off then back ON for the one frame. Is it my EXR clip that’s causing the problem or something else?

Thanks for the help!