I don’t believe I’ve ever seen a breaker installed above the main disconnect. I’ll include a pic of the panel diagram. I don’t believe it’s wrong but wanted to bounce it off the community. Thanks everyone 
That’s a MLO (main lug only) panel with a back-fed main circuit breaker. There is no requirement for it to occupy the top slot. It should have a clip or screw to hold it in place.
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Hope you did not miss the tandem breakers that are not allowed in that panel.
I disagree with you for I think the first time ever. The G2020MB is a main breaker panel that has 20 full size spaces rated for 20 circuits. Someone has messed with that panel and modified it.
Here is the full spec sheet, scroll to page 5. I used to sell Siemens gear so the part number stuck out to me. https://buy.wesco.com/static/catalog/products/images/PDF/SIEMENS_SIEMEAD00003_177_168-170_176_194.pdf
I would have to put some consideration in to how I write this up without being there and seeing everything associated with it.
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I’m afraid I did as a matter of fact but I’m not sure what you’re seeing there. Can you explain?
Looking at the wiring diagram for the panel it shows only one circuit per space. The cut sheet I linked in my last post states it as well. here is a random sniped image of what a diagram would show for tandem breakers:
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Something does not add up… looks like either the deadfront is from a different enclosure or the guts were changed. Something doesn’t look right.
I hope you didn’t open a panel in Ohio. Wink.
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Wow! Excellent information gentlemen. I really do appreciate it. Luckily, I have till tomorrow morning to write this up but I guess at the least, I can recommend review based on the diagram and the presence of double poles. Thanks again.
The learning is indeed endless.
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It’s the presence of Tandem breakers that are not allowed in that panel, and the fact that with the Tandems it exceeds the number of circuits allowed, which is 20.
Do you have a pic with deadfront installed showing all breakers?
Your panel is supposed to look like this, otherwise either the deadfront is from a different panel or the panel’s guts were changed:
Duplicate.
I only commented about the CB location based on the photo’s. It does appear that they’re not from the same panel.
Also, thank you for the correction/clarification on the tandem breakers Chris.
Panel replacement/upgrade required. Have licensed electrical contractor perform a load calculation and install properly sized panel.
This cover isn’t the same one in the first picture you posted.
In any event, I would guess, that this is an older home and someone, changed the panel themselves, without a permit (which is required here in Florida, but in PA, I don’t know).
Reading the label on the panel in the original post, it appears to be a 100 amp service, which, in most instances, will prevent you from getting insurance.
And, I hope, in the last picture of the cover, you didn’t install the cover with wiring in-between the cover and box! 
Am I reading this correctly? 100 AMP is the minimum acceptable size in a residential application.
That is what I understand, also.
The minimum accepted by numerous insurance companies is 125amps. I am looking for the letter from Citizens, and I may have posted it on this forum a few years ago, which stated the above. As well as, but not limited to, 20 year old shingle roofs, FPE panels, Polybutylene piping…and there may be more by now.