I signed the Offer, but the clauses were not explained to me at the time and I trusted and relied upon my buyers agent to safeguard my interests,

They may have breached their fiduciary duties but if you signed the offer and its been accepted you'll still be on the hook for it. You can't just get out of an offer by saying you didn't read it.

This is why it's important to use a reliable and trust worthy agent. This is a great example to show that not all agents are the same. Some are better than others. Unfortunately people often think all agents are equal and only pick the one they perceive will charge the lowest fees.

Your agent is sapose to read and explain all the clauses. If your agent did not do it, you should have asked before you put your signature. Anyway you can still read over your clauses and if you do not agree on any of them you can ask your agent to speak to the other agent about it and correct it. Most of the time this can be done through an amendment. We all make mistakes and learn from it. Hope this answers your question.

Which clause/clauses caused a problem?

Was it the preprinted clauses that weren't explained or one of the written ones?

And yes he definitely should have explained them but he/she may not necessarily understand them. Choose a more professional agent next time would be my recommendation

Any answer above is overstepping the guidelines outlined in REBBA2002 and should be disregarded. Once you enter in to a relationship with a Brokerage through the Buyer Agency agreement other REALTORS(R) need to respect that and is the reason I did not respond once you confirmed you had signed. As much as I would love to comment - your best solution is to seek independent legal advice. You will require a lawyer to close your transaction and so it shouldn't cost you any more to speak to them now regarding your concerns. If you feel this is premature, contact the Broker of Record for the Sales Representative/Broker you put the offer in with.