Serously, I'm a small frame on a specialized Sirrus ?

Looking at getting the specialized Sirrus Sport
I'm 5 9 with a 29 inside leg
Past bikes.
Giant Defy 2016 in a M, stand over was 770mm and as high as I dare.
https://www.giant-bicycles.com/gb/defy-2-disc-2016
Cube 29er in 17" https://www.cube.eu/uk/products/mtb-har ... hred-2016/
2004 Trek 4500 in 17"
http://archive.trekbikes.com/gb/en/2004 ... 00/details
The Geo chart on the special says get an S sized frame, not the M
https://www.specialized.com/us/en/men/b ... ort/115229
So I tried both the M and S sized Sirrus at the weekend, the M as to big and the S was pretty much spot on, do specialized have wacky sizing ?
I'm 5 9 with a 29 inside leg
Past bikes.
Giant Defy 2016 in a M, stand over was 770mm and as high as I dare.
https://www.giant-bicycles.com/gb/defy-2-disc-2016
Cube 29er in 17" https://www.cube.eu/uk/products/mtb-har ... hred-2016/
2004 Trek 4500 in 17"
http://archive.trekbikes.com/gb/en/2004 ... 00/details
The Geo chart on the special says get an S sized frame, not the M
https://www.specialized.com/us/en/men/b ... ort/115229
So I tried both the M and S sized Sirrus at the weekend, the M as to big and the S was pretty much spot on, do specialized have wacky sizing ?
Pinnacle Neon 3 2017
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I'm 5'10" with ~32.5" cycling inseam (I buy ~30" inside leg trousers), I would choose a medium or perhaps a large.
2020 Voodoo Marasa
2017 Cube Attain GTC Pro Disc 2016
2016 Voodoo Wazoo
The defy was close to the limit of what I could comfortably standover.
The small sirrus is 750
The medium sirrus is 786
The Marin Fairfax sc4 and Giant rapid in a M are 750mm standover
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Size M by the way, standover a smige high but nothing I can't deal with.
rode a lower spec in the size M in shop, bob on, non of they weird funky feeling the Boardman gave