Reserve typically refers to:
* Keeping something for a specific purpose or future use: "I reserve a table at the restaurant."
* Showing restraint or caution: "He answered the question with reserve."
* A supply or quantity held back for future use: "The military has a large reserve of ammunition."
Resent refers to:
* Feeling bitterness or indignation at having been treated unfairly: "She resented her sister's success."
* To be unwilling to accept something or someone: "I resent being told what to do."
Therefore, "reserve" and "resent" are not contradictory but rather describe entirely different concepts.