Weird Pattern from last night imaging

[astrocaptain (Caleb)]

Greetings all,

I was attempting M64 last night and this happened (See image; PI excess stretch to show artifacts)

https://imgur.com/a/AYEVPii

here's a blink of the dataset

Click here to load the video

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You might be able to see diminishing data over time. My theory is dewing on my mirror from the outside in. Would like input.

Gear:
F5 8" Newtonian
ASI294MC (non-cooled)
EQ6R

paired with:
ASI290MM
ASI60/280 Guide Scope

Thanks all, stay safe and clear skies!