The heart remodels (reshapes to be more like its old, smaller self) after the surgery. This often temporarily causes roller-coaster changes in blood pressure, runs of arrhythmias, and usually insignificant leakages in the other valves as the heart readjusts itself to the healing nerve nad muscle tissue and rapidly diminishing size. Sometimes the valve's leaflets don't "seat" right for a while on an enlarged heart or one that is rapidly changing shape.
If your insufficiency (regurgitation, leakage) in the tricuspid valve is listed as "trivial," then it is immaterial. Trivial insufficiencies come and go in any of the heart valves, including in 100% normal hearts, all the time, and can even result from how you are positioned for the echo. It is highly likely that it won't be there the next echo you have, or maybe the one after that. "Trivial" leakage is considered completely benign.
A "mild" tricuspid leak is not considered to have a negative impact on the operation of the heart. It may stick around, or it may go away as remodelling progresses. It will have no effect on your recovery, and as long as it isn't progressing or accompanied by other insufficiencies, it should have no real effect on your heart or its functioning in the forseeable future.