אי התאמה בהתנהלות הועלו מספר הצעות

Unless these suggestions were made in the brochure itself or on some official site, they don't seem appropriate to me:
"Procedural" refers to legal proceedings rather than conduct;
"Administerial" refers to administrative procedures rather than conduct.

My take:
1. Contractual non-conformance: Failure to meet contractual provisions. This would certainly include dubious forms of conduct, such as awarding fat contracts to your friends.

2. Non-conforming conduct (aka "misconduct") - i.e. cases that are not necessarily breaches of contract.

The plural in Heb can be translated as "types of", "cases of", etc.





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Note added at 3 days 1 hr (2019-10-03 18:00:28 GMT)
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I don't see anything confusing:
אי התאמה means non-conformance
אי התאמה בהתנהלות means non-conforming conduct

Obviously, contractual non-conformance is non-compliance with the contract, or failure to meet contractual provisions, while non-conforming conduct means misconduct, perhaps of a lesser severity than contractual non-compliance.
In this sense, these may overlap to a certain extent.
I don't think you have to worry about the philosophy of overlapping types of nonconformities. This is not the translator's job, although it's nice when things are clearly defined and not confusing!
HTH,
Sandra