Any idea on the amps for these split buss panels? Also, the GFCI on the left side of the first panel appeared to be mismatched and double tapped. Not sure if that breaker is rated for double tapping or not. Any thoughts would be helpful.
You will know when a breaker is designed for two conductors, because it will have a slot/groove/spot for each one.
Those are probably not designed for two conductors.
Would would indicate that these are split bus panels?
It also looks like you have more than one manufacturer’s breakers. Check the data tag to see which manufacturer’s breakers are allowed.