I think you are working on the synthesis of Ag NPs. Don't use the solution which you lost. Used the solution of bottle. Preparation of plant extract in not a difficult job.
It affected the total extract/ extracted weight, however if you dry the extraction and use the effect of the dried extract, it dosnt affected your result because you deal with effect of a certain amount of the extract
If the extract lost to the water bath, you can re-extract from water with immiscible organic solvent then evaporate the solvent and mix it with the mother extract.
But if escaped, it is not effect on the type of the components but affecting the quantity ( percentage of the extracted components , decrease).
I think you are working on the synthesis of Ag NPs. Don't use the solution which you lost. Used the solution of bottle. Preparation of plant extract in not a difficult job.