Are my GFCI outlets tripping each other?
As long as you are sure you have a panel GFCI breaker (not AFCI (AFCI + GFCI is fine, just not AFCI by itself)) then yes, you have a redundant system and can replace the GFCI receptacles with ordinary receptacles.

If the panel breaker is actually AFCI (and not also GFCI) then it is a good thing to have but does not provide sufficient protection for bathroom receptacles.

If the panel breaker is AFCI or AFCI+GFCI then you may have an arc fault triggering the panel breaker rather than a ground fault. These are two different types of problems with different fixes. The short version is:


Ground faults kill people, especially in wet areas (bathrooms &amp; kitchens). GFCIs stop the power fast enough to save you from serious injury or death. To work effectively, GFCIs can be installed anywhere from the panel up to the point of likely problem (e.g., the bathroom receptacle).
Arc faults cause fires. AFCIs protect your house from burning down by detecting the problems at an early stage. To work effectively, AFCIs need to be installed in or near the panel.


If you do replace the GFCI receptacles, I recommend getting a GFCI tester like this one. After installing the receptacles, test each one (and any other receptacles that are supposed to be protected by the panel GFCI breaker) to make sure that the panel breaker does trip when it is supposed to. If you find that the panel breaker does not always trip, then it may be failing and should be replaced.