Base in Modexp is incorrectly set

[AlexandreBelling]

While testing the integration with the prover I came upon the following inconsistencies regarding modexp:

block range 9529337-9529344

modexp operation, base=0x20 exp=0x1000000                                                          mod=0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001 res=0x1b0fc0964aebcfca92a80380c8bb0846a903a57bce28c1434e74d359611647b7 cpt=0x37fd2a79d4dfbb38a3bc91754fde9bea27048c0130ddc117b81d62dbbd03aa5
modexp operation, base=0x20 exp=0x1000000                                                          mod=0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001 res=0x1b0fc0964aebcfca92a80380c8bb0846a903a57bce28c1434e74d359611647b7 cpt=0x37fd2a79d4dfbb38a3bc91754fde9bea27048c0130ddc117b81d62dbbd03aa5
modexp operation, base=0x20 exp=0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593efffffff mod=0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001 res=0x1e876427f261ee21bfd5eeec260c1b9250cdf5955d9d765b61e304b0e1b5df86 cpt=0x2ee12bff4a2813286a8dc388cd754d9a3ef2490635eba50cb9c2e5e750800001
modexp operation, base=0x20 exp=0xffffff                                                           mod=0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001 res=0x26501ebfe559ea5826f023d3e76e4b66f170cd940408eb5590a4075c80b498d6 cpt=0x28f0a0c62aec4f00cfd5991ab7ed11dc8eff4e43274ce5db1d22b5e6405e81d6
modexp operation, base=0x20 exp=0x1000000                                                          mod=0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001 res=0x1b0fc0964aebcfca92a80380c8bb0846a903a57bce28c1434e74d359611647b7 cpt=0x37fd2a79d4dfbb38a3bc91754fde9bea27048c0130ddc117b81d62dbbd03aa5
modexp operation, base=0x20 exp=0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593efffffff mod=0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001 res=0x1c8493792eb0ac6348fed793d162c4e89ac9da03eb09774c2433e5b950707c38 cpt=0x2ee12bff4a2813286a8dc388cd754d9a3ef2490635eba50cb9c2e5e750800001
modexp operation, base=0x20 exp=0xffffff                                                           mod=0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001 res=0x26501ebfe559ea5826f023d3e76e4b66f170cd940408eb5590a4075c80b498d6 cpt=0x28f0a0c62aec4f00cfd5991ab7ed11dc8eff4e43274ce5db1d22b5e6405e81d6
modexp operation, base=0x20 exp=0xffffff                                                           mod=0x30644e72e131a029b85045b68181585d2833e84879b9709143e1f593f0000001 res=0x218d2bc8161ed2ff496409561f9de610e74f13d2ceb611db5ecbbfdde2fbb369 cpt=0x28f0a0c62aec4f00cfd5991ab7ed11dc8eff4e43274ce5db1d22b5e6405e81d6

What lead me to think that the base is the issue is because 0x20 = 32 is likely to be the byte-length of the base and not the base itself and all the other fields seem completely legit and also because this is the only field that is always the same.