Submitted by hickuphh3, also found by leastwood
Solidity division rounds down, so doing M / 2 <= N checks mean that M can be at most 2N + 1.
This affects the following checks:
Note that with the current implementation, if _tokenURIs is of odd length, its last element will be  redundant, but market creation will not revert.
The stricter checks will partially mitigate _tokenURIs having odd length because _cardAffiliateAddresses is now required to be exactly twice that of _tokenURIs.
These checks should be modified to:
In addition, consider adding a check for _tokenURIs to strictly be of even length.
require(_tokenURIs.length % 2 == 0, "TokenURI Length Error");
Splidge (Reality Cards) confirmed and patched:
